It seems like $this->driver->dataManag...te($values['commands']) can be null. However, the property $results is declared as array. Maybe change the type of the property to array|null or add a type check?
Our type inference engine has found an assignment of a scalar value (like a
string, an integer or null) to a property which is an array.
Either this assignment is in error or the assigned type should be added
to the documentation/type hint for that property.
To type hint that a parameter can be either an array or null, you can set
a type hint of array and a default value of null. The PHP interpreter will
then accept both an array or null for that parameter.
This check looks from parameters that have been defined for a function or method, but which are not used in the method body.