prevent errors when a user backends gives an invalid result
prevent errors when a user backends gives an invalid result

pollopolea/core,cernbox/core,andreas-p/nextcloud-server,owncloud/core,jbicha/server,whitekiba/server,nextcloud/server,lrytz/core,lrytz/core,whitekiba/server,cernbox/core,pollopolea/core,michaelletzgus/nextcloud-server,IljaN/core,lrytz/core,Ardinis/server,pmattern/server,andreas-p/nextcloud-server,endsguy/server,pmattern/server,xx621998xx/server,IljaN/core,endsguy/server,sharidas/core,pmattern/server,whitekiba/server,bluelml/core,pixelipo/server,andreas-p/nextcloud-server,Ardinis/server,michaelletzgus/nextcloud-server,owncloud/core,xx621998xx/server,endsguy/server,whitekiba/server,sharidas/core,pixelipo/server,bluelml/core,jbicha/server,bluelml/core,Ardinis/server,pollopolea/core,xx621998xx/server,endsguy/server,phil-davis/core,andreas-p/nextcloud-server,endsguy/server,IljaN/core,michaelletzgus/nextcloud-server,pixelipo/server,nextcloud/server,bluelml/core,owncloud/core,cernbox/core,cernbox/core,owncloud/core,whitekiba/server,Ardinis/server,sharidas/core,pixelipo/server,jbicha/server,owncloud/core,xx621998xx/server,jbicha/server,lrytz/core,pixelipo/server,michaelletzgus/nextcloud-server,bluelml/core,IljaN/core,nextcloud/server,andreas-p/nextcloud-server,pollopolea/core,sharidas/core,IljaN/core,lrytz/core,pollopolea/core,sharidas/core,nextcloud/server,xx621998xx/server,cernbox/core,Ardinis/server,pmattern/server,jbicha/server,pmattern/server