From Diffen

MediaWiki internal error.

Original exception: exception 'DBQueryError' with message 'A database error has occurred
Query: SELECT entity_id, entity_revision FROM diffen_entity WHERE entity_id in (,)
Function:
Error: 1064 You have an error in your SQL syntax; check the manual that corresponds to your MySQL server version for the right syntax to use near ')' at line 1 (localhost)
' in /var/www/diffen.com/public/difference/includes/Database.php:708
Stack trace:
#0 /var/www/diffen.com/public/difference/includes/Database.php(665): Database->reportQueryError('You have an err...', 1064, 'SELECT entity_i...', '', false)
#1 /var/www/diffen.com/public/difference/extensions/DiffenFunctions.php(475): Database->query('SELECT entity_i...')
#2 /var/www/diffen.com/public/difference/extensions/DiffenFunctions.php(771): getRevisionFromEntityID(Array)
#3 /var/www/diffen.com/public/difference/skins/MistyLook.php(197): diffenRender3('Mp3 vs Mp4', '524')
#4 /var/www/diffen.com/public/difference/includes/SkinTemplate.php(464): MistyLookTemplate->execute()
#5 /var/www/diffen.com/public/difference/includes/OutputPage.php(644): SkinTemplate->outputPage(Object(OutputPage))
#6 /var/www/diffen.com/public/difference/includes/Wiki.php(282): OutputPage->output()
#7 /var/www/diffen.com/public/difference/index.php(57): MediaWiki->finalCleanup(Array, Object(LoadBalancer), Object(OutputPage))
#8 {main}

Exception caught inside exception handler: exception 'DBUnexpectedError' with message 'Error in fetchObject(): You have an error in your SQL syntax; check the manual that corresponds to your MySQL server version for the right syntax to use near ')' at line 1 (localhost)' in /var/www/diffen.com/public/difference/includes/Database.php:825
Stack trace:
#0 /var/www/diffen.com/public/difference/extensions/DiffenFunctions.php(476): Database->fetchObject(false)
#1 /var/www/diffen.com/public/difference/extensions/DiffenFunctions.php(771): getRevisionFromEntityID(Array)
#2 /var/www/diffen.com/public/difference/skins/MistyLook.php(197): diffenRender3('Database error', '524')
#3 /var/www/diffen.com/public/difference/includes/SkinTemplate.php(464): MistyLookTemplate->execute()
#4 /var/www/diffen.com/public/difference/includes/OutputPage.php(644): SkinTemplate->outputPage(Object(OutputPage))
#5 /var/www/diffen.com/public/difference/includes/Exception.php(74): OutputPage->output()
#6 /var/www/diffen.com/public/difference/includes/Exception.php(95): MWException->reportHTML()
#7 /var/www/diffen.com/public/difference/includes/Exception.php(171): MWException->report()
#8 /var/www/diffen.com/public/difference/includes/Exception.php(205): wfReportException(Object(DBQueryError))
#9 [internal function]: wfExceptionHandler(Object(DBQueryError))
#10 {main}