Database error

From Plastic Tub

A database query syntax error has occurred. This may indicate a bug in the software. The last attempted database query was:
(SQL query hidden)
from within function "MediaWikiBagOStuff:_doquery". MySQL returned error "1062: Duplicate entry 'undule2:pcache:idhash:0-1!1!0!1!0!1!0!!en' for key 'PRIMARY' (localhost)".
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