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MW 1.20, Extension:ReplaceText v0.9.5, amazon EC2, linux

Tried replacing text with another, now RecentChanges and a page history cause MWException.


Backtrace:
[409d688c] /wiki/Special:RecentChanges   Exception from line 594 of /opt/var/www/htdocs/nethackwiki.com/mediawiki-1.20.0/includes/Message.php: Invalid message parameter
#0 /opt/var/www/htdocs/nethackwiki.com/mediawiki-1.20.0/includes/Message.php(568): Message->extractParam(Array)
#1 /opt/var/www/htdocs/nethackwiki.com/mediawiki-1.20.0/includes/Message.php(424): Message->replaceParameters('($1)', 'before')
#2 /opt/var/www/htdocs/nethackwiki.com/mediawiki-1.20.0/includes/Message.php(507): Message->toString()
#3 /opt/var/www/htdocs/nethackwiki.com/mediawiki-1.20.0/includes/Linker.php(1499): Message->escaped()
#4 /opt/var/www/htdocs/nethackwiki.com/mediawiki-1.20.0/includes/ChangesList.php(435): Linker::commentBlock('Text replace - ...', Object(Title))
#5 /opt/var/www/htdocs/nethackwiki.com/mediawiki-1.20.0/includes/ChangesList.php(642): ChangesList->insertComment(Object(RecentChange))
#6 /opt/var/www/htdocs/nethackwiki.com/mediawiki-1.20.0/includes/specials/SpecialRecentchanges.php(528): OldChangesList->recentChangesLine(Object(RecentChange), false, 2)
#7 /opt/var/www/htdocs/nethackwiki.com/mediawiki-1.20.0/includes/specials/SpecialRecentchanges.php(179): SpecialRecentChanges->webOutput(Object(ResultWrapper), Object(FormOptions))
#8 /opt/var/www/htdocs/nethackwiki.com/mediawiki-1.20.0/includes/SpecialPage.php(611): SpecialRecentChanges->execute(NULL)
#9 /opt/var/www/htdocs/nethackwiki.com/mediawiki-1.20.0/includes/SpecialPageFactory.php(494): SpecialPage->run(NULL)
#10 /opt/var/www/htdocs/nethackwiki.com/mediawiki-1.20.0/includes/Wiki.php(290): SpecialPageFactory::executePath(Object(Title), Object(RequestContext))
#11 /opt/var/www/htdocs/nethackwiki.com/mediawiki-1.20.0/includes/Wiki.php(536): MediaWiki->performRequest()
#12 /opt/var/www/htdocs/nethackwiki.com/mediawiki-1.20.0/includes/Wiki.php(446): MediaWiki->main()
#13 /opt/var/www/htdocs/nethackwiki.com/mediawiki-1.20.0/index.php(59): MediaWiki->run()
#14 {main}

For some reason, extractParam() function in include/Message.php gets an empty array as a $param. I did a quick'n'dirty hack to handle that case.


What I did:

1) Entered the following as "original text":
\[\[[sS]pellbook of (dig|magic missile|fireball|cone of cold|sleep|finger of death|light|detect monsters|healing|knock|force bolt|confuse monster|cure blindness|drain life|slow monster|wizard lock|create monster|detect food|cause fear|clairvoyance|cure sickness|charm monster|haste self|detect unseen|levitation|extra healing|restore ability|invisibility|detect treasure|remove curse|magic mapping|identify|turn undead|polymorph|teleport away|create familiar|cancellation|protection|jumping|stone to flesh|flame sphere|freeze sphere|blank paper)\|(dig|magic missile|fireball|cone of cold|sleep|finger of death|light|detect monsters|healing|knock|force bolt|confuse monster|cure blindness|drain life|slow monster|wizard lock|create monster|detect food|cause fear|clairvoyance|cure sickness|charm monster|haste self|detect unseen|levitation|extra healing|restore ability|invisibility|detect treasure|remove curse|magic mapping|identify|turn undead|polymorph|teleport away|create familiar|cancellation|protection|jumping|stone to flesh|flame sphere|freeze sphere|blank paper)\]\]

2) Entered the following as "replacement text":
{{spell of|$1}}

3) Ticked "use regular expressions"

4) Selected several namespaces (Main, NetHackWiki, File, Source, ...)

5) Clicked continue.

6) Ignored the warning that the replacement string already exists.

6) Of all the articles that matched, only selected the first one (http://nethackwiki.com/wiki/Aligned_priest)

7) "Replace"

Afterwards, RC and the history page for the Aligned_priest -article throw the MWException.
Disabling any and all extensions doesn't help.