Fix bug 49390
Fix bug 49390

cover may be missing

ONLYOFFICE/core,ONLYOFFICE/core,ONLYOFFICE/core,ONLYOFFICE/core,ONLYOFFICE/core,ONLYOFFICE/core,ONLYOFFICE/core,ONLYOFFICE/core,ONLYOFFICE/core,ONLYOFFICE/core,ONLYOFFICE/core