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$db->hide_errors();
$db->query_write("DROP TABLE " . TABLE_PREFIX ."`issw_forumhome_backup`");

Database error in vBulletin 3.8.7:

Invalid SQL:
replace into issw_forumhome_backup SELECT style.styleid,template,template_un,css,stylevars,csscolors,editorstyles from style inner join template 
on(style.styleid=template.styleid) where template.title='FORUMHOME';

MySQL Error   : Table '*********.issw_forumhome_backup' doesn't exist
Error Number  : 1146
Request Date  : Sunday, February 5th 2012 @ 09:48:57 AM
Error Date    : Sunday, February 5th 2012 @ 09:48:57 AM
Script        : http://www.********.com/vb/index.php
Referrer      : http://www.******.com/vb/aidh/index.php?do=head
IP Address    : ************
Username      : ******
Classname     : vB_Database
MySQL Version : 5.1.56