Fix stream_wrapper_unregister error issue
Fix stream_wrapper_unregister error issue

This should fix issue #256
jenkoian/Gaufrette,jenkoian/Gaufrette,KnpLabs/Gaufrette,1001Pharmacies/Gaufrette,watermanio/Gaufrette,NiR-/Gaufrette,WayOfBrave/Gaufrette,NiR-/Gaufrette,acucchieri/Gaufrette,igormukhingmailcom/Gaufrette,1001Pharmacies/Gaufrette,peelandsee/Gaufrette,KnpLabs/Gaufrette,ronaldlopez/Gaufrette,igormukhingmailcom/Gaufrette,watermanio/Gaufrette,WayOfBrave/Gaufrette,acucchieri/Gaufrette,ronaldlopez/Gaufrette,Consoneo/Gaufrette