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                <?php namespace Cviebrock\EloquentSluggable;  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                use Cviebrock\EloquentSluggable\Services\SlugService;  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                use Illuminate\Contracts\Events\Dispatcher;  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                use Illuminate\Database\Eloquent\Model;  | 
            
            
                                                                                                            
                                                                
            
                                    
            
            
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                class SluggableObserver  | 
            
            
                                                                        
                            
            
                                    
            
            
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                { | 
            
            
                                                                        
                            
            
                                    
            
            
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                    /**  | 
            
            
                                                                        
                            
            
                                    
            
            
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                     * @var \Cviebrock\EloquentSluggable\Services\SlugService  | 
            
            
                                                                        
                            
            
                                    
            
            
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                     */  | 
            
            
                                                                        
                            
            
                                    
            
            
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                    private $slugService;  | 
            
            
                                                                        
                            
            
                                    
            
            
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                    /**  | 
            
            
                                                                        
                            
            
                                    
            
            
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                     * @var \Illuminate\Contracts\Events\Dispatcher  | 
            
            
                                                                        
                            
            
                                    
            
            
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                     */  | 
            
            
                                                                        
                            
            
                                    
            
            
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                    private $events;  | 
            
            
                                                                        
                            
            
                                    
            
            
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                    /**  | 
            
            
                                                                        
                            
            
                                    
            
            
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                     * SluggableObserver constructor.  | 
            
            
                                                                        
                            
            
                                    
            
            
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                     *  | 
            
            
                                                                        
                            
            
                                    
            
            
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                     * @param \Cviebrock\EloquentSluggable\Services\SlugService $slugService  | 
            
            
                                                                        
                            
            
                                    
            
            
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                     * @param \Illuminate\Contracts\Events\Dispatcher $events  | 
            
            
                                                                        
                            
            
                                    
            
            
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                     */  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                    public function __construct(SlugService $slugService, Dispatcher $events)  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                    { | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                        $this->slugService = $slugService;  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                        $this->events = $events;  | 
            
            
                                                                                                            
                                                                
            
                                    
            
            
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                    }  | 
            
            
                                                                        
                            
            
                                    
            
            
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                    /**  | 
            
            
                                                                        
                            
            
                                    
            
            
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                     * @param \Illuminate\Database\Eloquent\Model $model  | 
            
            
                                                                        
                            
            
                                    
            
            
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                     * @return boolean|null  | 
            
            
                                                                        
                            
            
                                    
            
            
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                     */  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                    public function saving(Model $model)  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                    { | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                        return $this->generateSlug($model, 'saving');  | 
            
            
                                                                                                            
                                                                
            
                                    
            
            
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                    }  | 
            
            
                                                                        
                            
            
                                    
            
            
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                    /**  | 
            
            
                                                                        
                            
            
                                    
            
            
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                     * @param \Illuminate\Database\Eloquent\Model $model  | 
            
            
                                                                        
                            
            
                                    
            
            
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                     * @param string $event  | 
            
            
                                                                        
                            
            
                                    
            
            
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                     * @return boolean|null  | 
            
            
                                                                        
                            
            
                                    
            
            
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                     */  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                    protected function generateSlug(Model $model, $event)  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                    { | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                        // If the "slugging" event returns a value, abort  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                        if ($this->fireSluggingEvent($model, $event) !== null) { | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                            return;  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                        }  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                        $wasSlugged = $this->slugService->slug($model);  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                        $this->fireSluggedEvent($model, $wasSlugged);  | 
            
                            
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                    }  | 
            
            
                                                                        
                            
            
                                    
            
            
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                    /**  | 
            
            
                                                                        
                            
            
                                    
            
            
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                     * Fire the namespaced validating event.  | 
            
            
                                                                        
                            
            
                                    
            
            
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                     *  | 
            
            
                                                                        
                            
            
                                    
            
            
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                     * @param  \Illuminate\Database\Eloquent\Model $model  | 
            
            
                                                                        
                            
            
                                    
            
            
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                     * @param  string $event  | 
            
            
                                                                        
                            
            
                                    
            
            
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                     * @return mixed  | 
            
            
                                                                        
                            
            
                                    
            
            
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                     */  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                    protected function fireSluggingEvent(Model $model, $event)  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                    { | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                        return $this->events->until('eloquent.slugging: ' . get_class($model), [$model, $event]); | 
            
            
                                                                                                            
                                                                
            
                                    
            
            
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                    }  | 
            
            
                                                                        
                            
            
                                    
            
            
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                    /**  | 
            
            
                                                                        
                            
            
                                    
            
            
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                     * Fire the namespaced post-validation event.  | 
            
            
                                                                        
                            
            
                                    
            
            
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                     *  | 
            
            
                                                                        
                            
            
                                    
            
            
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                     * @param  \Illuminate\Database\Eloquent\Model $model  | 
            
            
                                                                        
                            
            
                                    
            
            
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                     * @param  string $status  | 
            
            
                                                                        
                            
            
                                    
            
            
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                     * @return void  | 
            
            
                                                                        
                            
            
                                    
            
            
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                     */  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                    protected function fireSluggedEvent(Model $model, $status)  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                    { | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                        $this->events->fire('eloquent.slugged: ' . get_class($model), [$model, $status]); | 
            
            
                                                                                                            
                                                                
            
                                    
            
            
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                    }  | 
            
            
                                                        
            
                                    
            
            
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                }  | 
            
            
                                                        
            
                                    
            
            
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It seems like the type of the argument is not accepted by the function/method which you are calling.
In some cases, in particular if PHP’s automatic type-juggling kicks in this might be fine. In other cases, however this might be a bug.
We suggest to add an explicit type cast like in the following example: