Database error

From LoveToKnow 1911

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 'legacy_1911:messages:Sitenotice' for key 1 (db0)".
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