while trying to move a page:
2015-11-14 18:50:57 silver labswiki exception ERROR: [0e00fe2a] /w/index.php?title=Special:MovePage&action=submit MWException from line 220 of /srv/mediawiki/php-1.27.0-wmf.6/includes/Hooks.php: Detected bug in an extension! Hook SMWParseData::onTitleMoveComplete has invalid call signature; Parameter 3 to SMWParseData::onTitleMoveComplete() expected to be a reference, value given {"exception_id":"0e00fe2a"} [Exception MWException] (/srv/mediawiki/php-1.27.0-wmf.6/includes/Hooks.php:220) Detected bug in an extension! Hook SMWParseData::onTitleMoveComplete has invalid call signature; Parameter 3 to SMWParseData::onTitleMoveComplete() expected to be a reference, value given #0 /srv/mediawiki/php-1.27.0-wmf.6/includes/MovePage.php(376): Hooks::run(string, array) #1 [internal function]: MovePage->{closure}() #2 /srv/mediawiki/php-1.27.0-wmf.6/includes/db/Database.php(3310): call_user_func(Closure) #3 /srv/mediawiki/php-1.27.0-wmf.6/includes/db/Database.php(3557): DatabaseBase->runOnTransactionIdleCallbacks() #4 /srv/mediawiki/php-1.27.0-wmf.6/includes/db/loadbalancer/LoadBalancer.php(1056): DatabaseBase->commit(string, string) #5 [internal function]: LoadBalancer->commitMasterChanges() #6 /srv/mediawiki/php-1.27.0-wmf.6/includes/db/loadbalancer/LBFactory.php(186): call_user_func_array(array, array) #7 [internal function]: LBFactory->{closure}(LoadBalancer, string, array) #8 /srv/mediawiki/php-1.27.0-wmf.6/includes/db/loadbalancer/LBFactoryMulti.php(397): call_user_func_array(Closure, array) #9 /srv/mediawiki/php-1.27.0-wmf.6/includes/db/loadbalancer/LBFactory.php(187): LBFactoryMulti->forEachLB(Closure, array) #10 /srv/mediawiki/php-1.27.0-wmf.6/includes/db/loadbalancer/LBFactory.php(204): LBFactory->forEachLBCallMethod(string) #11 /srv/mediawiki/php-1.27.0-wmf.6/includes/MediaWiki.php(533): LBFactory->commitMasterChanges() #12 /srv/mediawiki/php-1.27.0-wmf.6/includes/MediaWiki.php(709): MediaWiki->doPreOutputCommit() #13 /srv/mediawiki/php-1.27.0-wmf.6/includes/MediaWiki.php(506): MediaWiki->main() #14 /srv/mediawiki/php-1.27.0-wmf.6/index.php(41): MediaWiki->run() #15 /srv/mediawiki/w/index.php(3): require(string) #16 {main}