(3.0.2) Can't delete shopper field

[Gouz]

I get this error when trying to delete.

Unknown column ''.title.'' in 'jos_virtuemart_userinfos' SQL=ALTER TABLE `jos_virtuemart_userinfos` CHANGE `'.title.'` `'.title_DELETED_1419559019.'` VARCHAR(255)

From my point of view, if we were not supposed to delete specific fields, then we should either be prevented or at least alerted before trying to. This is crucial because i accidently ruined the DB after deleting some.