Can't access Drafts folder

[Chev]

So, I've been answering my questionnaire for SCRA and I've decided to leave my computer for a while, so I've saved everything as draft. The problem is that I can't open the folder for some reason. This is what I get:

MyBB has experienced an internal SQL error and cannot continue.

SQL Error:
1054 - Unknown column 'Guest' in 'where clause'
Query:
SELECT uid, username, usergroup, displaygroup FROM mybb_dgc_users WHERE uid IN (19632,Guest)

What I'm supposed to do now? Just please, don't tell me that it's lost forever, because it took me some time to fill.

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