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From George Eastman House : Notes On Photographs

Detected bug in an extension! Hook efCategoryTreeParserOutput failed to return a value; should return true to continue hook processing or false to abort.

Backtrace:

#0 /var/www/vhosts/notesonphotographs.org/notesonphotographs.org/includes/OutputPage.php(565): wfRunHooks('OutputPageParse...', Array)
#1 /var/www/vhosts/notesonphotographs.org/notesonphotographs.org/includes/OutputPage.php(573): OutputPage->addParserOutputNoText(Object(ParserOutput))
#2 /var/www/vhosts/notesonphotographs.org/notesonphotographs.org/includes/OutputPage.php(678): OutputPage->addParserOutput(Object(ParserOutput))
#3 /var/www/vhosts/notesonphotographs.org/notesonphotographs.org/includes/Article.php(870): OutputPage->tryParserCache(Object(Article))
#4 /var/www/vhosts/notesonphotographs.org/notesonphotographs.org/includes/Wiki.php(450): Article->view()
#5 /var/www/vhosts/notesonphotographs.org/notesonphotographs.org/includes/Wiki.php(63): MediaWiki->performAction(Object(OutputPage), Object(Article), Object(Title), Object(User), Object(WebRequest))
#6 /var/www/vhosts/notesonphotographs.org/notesonphotographs.org/index.php(116): MediaWiki->initialize(Object(Title), Object(Article), Object(OutputPage), Object(User), Object(WebRequest))
#7 {main}