Internal Server Error

[dc2d0d07] /mediawiki/api.php?action=feedcontributions&user=Ryan+Connor&feedformat=atom MWException from line 226 of /var/www/html/mediawiki-1.25.2/includes/Hooks.php: Detected bug in an extension! Hook Cite::clearState has invalid call signature; Parameter 1 to Cite::clearState() expected to be a reference, value given
Backtrace:
#0 /var/www/html/mediawiki-1.25.2/includes/parser/Parser.php(376): Hooks::run(string, array)
#1 /var/www/html/mediawiki-1.25.2/includes/parser/Parser.php(5025): Parser->clearState()
#2 /var/www/html/mediawiki-1.25.2/includes/parser/Parser.php(631): Parser->startParse(Title, ParserOptions, integer, boolean)
#3 /var/www/html/mediawiki-1.25.2/includes/parser/Parser.php(5051): Parser->preprocess(string, Title, ParserOptions)
#4 /var/www/html/mediawiki-1.25.2/includes/cache/MessageCache.php(994): Parser->transformMsg(string, ParserOptions, Title)
#5 /var/www/html/mediawiki-1.25.2/includes/Message.php(1058): MessageCache->transform(string, boolean, Language, Title)
#6 /var/www/html/mediawiki-1.25.2/includes/Message.php(726): Message->transformText(string)
#7 /var/www/html/mediawiki-1.25.2/includes/Message.php(789): Message->toString()
#8 /var/www/html/mediawiki-1.25.2/includes/OutputPage.php(928): Message->text()
#9 /var/www/html/mediawiki-1.25.2/includes/OutputPage.php(975): OutputPage->setHTMLTitle(Message)
#10 /var/www/html/mediawiki-1.25.2/includes/api/ApiFormatBase.php(185): OutputPage->setPageTitle(string)
#11 /var/www/html/mediawiki-1.25.2/includes/api/ApiMain.php(1251): ApiFormatBase->closePrinter()
#12 /var/www/html/mediawiki-1.25.2/includes/api/ApiMain.php(502): ApiMain->printResult(boolean)
#13 /var/www/html/mediawiki-1.25.2/includes/api/ApiMain.php(438): ApiMain->handleException(MWException)
#14 /var/www/html/mediawiki-1.25.2/includes/api/ApiMain.php(409): ApiMain->executeActionWithErrorHandling()
#15 /var/www/html/mediawiki-1.25.2/api.php(88): ApiMain->execute()
#16 {main}