edit post query failed

I'm using Serendipity since a year. From today, I ca'nt edit posts.   
I've the following error :
Query failed:
SELECT


                     e.id,
                     e.title,
                     e.timestamp,
                     e.comments,
                     e.exflag,
                     e.author,
                     e.authorid,
                     e.trackbacks,
                     e.isdraft,
                     e.allow_comments,
                     e.last_modified,

                     a.realname AS author,
                     a.email



                 FROM
                     serendipity_entries AS e
                     LEFT JOIN serendipity_authors a
                         ON e.authorid = a.authorid
                     LEFT JOIN serendipity_entrycat ec
                         ON e.id = ec.entryid
                     LEFT JOIN serendipity_category c
                         ON ec.categoryid = c.categoryid


                     GROUP BY e.id
                     ORDER BY timestamp DESC
                      LIMIT 0, 12
/ Can't find record in ''
Any help would be appreciated.

Pierre

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