Plugin: MyCRED php error

I’m getting an error for MyCred’s History page that says

Fatal error: Allowed memory size of 268435456 bytes exhausted (tried to allocate 72 bytes) in /home/site6/public_html/wp-includes/wp-db.php on line 1456

I’ve edited the two wp-related php.ini files, and wp-config files all have a memory limit of 1024 mb. I do not have access to the server’s php.ini but would assume this is probably what is causing the problem?

Neither can I access .htaccess and follow the possible solution listed here. I’m hesitant to contact the server (since this is a vserver), since they probably wouldn’t want to increase the limit over 256. The reason I’m posting here is I’m wondering if something is wrong, or there’s anything I can do since the page is trying to consume 256mb of memory.