"Bawolff" posted a comment on MediaWiki.r108145.
URL: http://www.mediawiki.org/wiki/Special:Code/MediaWiki/108145#c29022
Commit summary for MediaWiki.r108145:
(bug 33321. Sort of) Adding a line to MediaWiki:Sidebar that contains a pipe,
but doesn't
have any pipes after being transformed by MessageCache, causes exception on
all pages.
This can happen with lines like:
**{{#if:yes|Something}}
Thank you to liangent for figuring out how to escape a | without {{!}} existing
and | not working.
Bawolff's comment:
Tagging 1.18. Its very easy for a user to totally screw up their wiki in a way
thats difficult to revert (aka need to use maintinance script or api to revert
a bad edit to sidebar that triggers this bug).
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