I was just editing User:Clutch/mod_wiki and tried to save it, and got the following error:

A database query syntax error has occurred. This could be because of an illegal search query (see Searching Wikipedia), or it may indicate a bug in the software. The last attempted database query was:

INSERT INTO watchlist (wl_user, wl_page) VALUES (2583,152410)

from within function "". MySQL returned error "1062: Duplicate entry '2583-152410' for key 1".