error after payment

i have a problem with my website and litespeed...
when a client do an order, everything work fine but he have an error message on the top of the website page...
the error is : Notice: Undefined index: order in /home/capohdkw/public_html/modules/litespeedcache/classes/Cache.php on line 510
it's a problem because the client are asking me if the order is ok or no... it is but i have to fix it...
how can i do? thank you
prestashop version


Staff member
seems a ticket has been logged and it is currently under investigation. Generally, an issue should not be reported to multiple places, which make it duplicated.