50a51,52
>     $add_default = "";
>     if (isset($db_prefix['default'])) $add_default = $db_prefix['default'];
52c54
<       $new_prefix[$table] = $prefix;
---
>       isset($db_prefix[$table])? $new_prefix[$table] = $db_prefix[$table] . $prefix : $new_prefix[$table] = $add_default . $prefix;