WYSIWYG office import fail in virtual mode

I get

Error number 3202 in 3: Exception while reading document Test.oo Wrapped Exception: Error number 3301 in 3: Exception while switching to database null Wrapped Exception: Unknown database 'null'

when i try to import an office document in WYSIWYG.

"Exception while switching to database null Wrapped Exception: Unknown database 'null'

This error look like a XWikiContext not properly initialized which contains a null database.

Another issue is that i don't see anything in the log, it would be better to put something in the log also for such an error i think.