|  | @@ -100,7 +100,7 @@ | 
                                                    
                                                        |  |  |  block discarded – undo | 
                                                                                                                                                                                                                    
                                                            | 100 | 100 |                  $sortKey = Date::getSortKeyDate($variable, $dataItem); | 
                                                                                                            
                                                            | 101 | 101 |              } else if ($key->isMacro()){ | 
                                                                                                            
                                                            | 102 | 102 |                  $sortKey = mb_strtolower(strip_tags(CiteProc::getContext()->getMacro($key->getMacro())->render($dataItem, $citationNumber))); | 
                                                                                                            
                                                            | 103 |  | -            }  else if ($variable === "citation-number"){ | 
                                                                                                            
                                                            |  | 103 | +            } else if ($variable === "citation-number"){ | 
                                                                                                            
                                                            | 104 | 104 |                  $sortKey = $citationNumber + 1; | 
                                                                                                            
                                                            | 105 | 105 |              } else { | 
                                                                                                            
                                                            | 106 | 106 |                  $sortKey = mb_strtolower(strip_tags($dataItem->{$variable})); | 
                                                                                                                                                
                                         
                                        
                                            
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