MediaWiki internal error.

Original exception: exception 'MWException' with message 'Detected bug in an extension! Hook efGoogleAnalyticsHookText failed to return a value; should return true to continue hook processing or false to abort.' in /is/htdocs/wp1032983_HQY7YC3PMF/www/daniel/includes/Hooks.php:137
Stack trace:
#0 /is/htdocs/wp1032983_HQY7YC3PMF/www/daniel/includes/Skin.php(908): wfRunHooks('SkinAfterBottom...', Array)
#1 /is/htdocs/wp1032983_HQY7YC3PMF/www/daniel/includes/SkinTemplate.php(401): Skin->bottomScripts()
#2 /is/htdocs/wp1032983_HQY7YC3PMF/www/daniel/includes/OutputPage.php(945): SkinTemplate->outputPage(Object(OutputPage))
#3 /is/htdocs/wp1032983_HQY7YC3PMF/www/daniel/includes/Wiki.php(342): OutputPage->output()
#4 /is/htdocs/wp1032983_HQY7YC3PMF/www/daniel/index.php(115): MediaWiki->finalCleanup(Array, Object(OutputPage))
#5 {main}

Exception caught inside exception handler: exception 'MWException' with message 'Detected bug in an extension! Hook efGoogleAnalyticsHookText failed to return a value; should return true to continue hook processing or false to abort.' in /is/htdocs/wp1032983_HQY7YC3PMF/www/daniel/includes/Hooks.php:137
Stack trace:
#0 /is/htdocs/wp1032983_HQY7YC3PMF/www/daniel/includes/Skin.php(908): wfRunHooks('SkinAfterBottom...', Array)
#1 /is/htdocs/wp1032983_HQY7YC3PMF/www/daniel/includes/SkinTemplate.php(401): Skin->bottomScripts()
#2 /is/htdocs/wp1032983_HQY7YC3PMF/www/daniel/includes/OutputPage.php(945): SkinTemplate->outputPage(Object(OutputPage))
#3 /is/htdocs/wp1032983_HQY7YC3PMF/www/daniel/includes/Exception.php(159): OutputPage->output()
#4 /is/htdocs/wp1032983_HQY7YC3PMF/www/daniel/includes/Exception.php(183): MWException->reportHTML()
#5 /is/htdocs/wp1032983_HQY7YC3PMF/www/daniel/includes/Exception.php(269): MWException->report()
#6 /is/htdocs/wp1032983_HQY7YC3PMF/www/daniel/includes/Exception.php(327): wfReportException(Object(MWException))
#7 [internal function]: wfExceptionHandler(Object(MWException))
#8 {main}