At the moment, it can theoretically return an integer as the class variable `$originalNodeParent` is set to 0 in [line 411](https://github.com/jeromegamez/ezpublish/blob/078e207af33d1609254d852d8e118871c383ae2b/kernel/classes/ezcontentobjecttrashnode.php#L411) and [line 357](https://github.com/jeromegamez/ezpublish/blob/078e207af33d1609254d852d8e118871c383ae2b/kernel/classes/ezcontentobjecttrashnode.php#L357) returns `$this->originalNodeParent`.