Internal error

From Wikibon

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

Backtrace:

#0 /var/www/html/wikibon.org/w/includes/MessageCache.php(785): wfRunHooks('LoadAllMessages')
#1 /var/www/html/wikibon.org/w/includes/EditPage.php(133): MessageCache->loadAllMessages('en')
#2 /var/www/html/wikibon.org/w/includes/EditPage.php(392): EditPage->getContent()
#3 /var/www/html/wikibon.org/w/includes/EditPage.php(346): EditPage->edit()
#4 /var/www/html/wikibon.org/w/includes/Wiki.php(505): EditPage->submit()
#5 /var/www/html/wikibon.org/w/includes/Wiki.php(63): MediaWiki->performAction(Object(OutputPage), Object(Article), Object(Title), Object(User), Object(WebRequest))
#6 /var/www/html/wikibon.org/w/index.php(116): MediaWiki->initialize(Object(Title), Object(Article), Object(OutputPage), Object(User), Object(WebRequest))
#7 {main}