[xwiki-users] Ghost pages which cannot be deleted

Dear community, I'm just getting used to Xwiki and will have to clean up a rather old database. This involves also moving and deleting single pages or whole spaces. Now I have an issue: When I delete a certain page (which is actually the last one remaining in its space), Xwiki tells me it is deleted, however the space does still exist. The space is empty except for the one page (also, no WebHome is there anymore). If I look at the document index of that space, I can only see the "deleted" page, which has not got any author anymore (field is empty). I can "delete" that page over and over again without any change of results (also, emptying of the recycle bin does not help). Any idea would greatly be appreciated! Regards, Markus