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[muhammed elbanna]

i had a problem when new client try to buy a product and after he write all his details and click to pay it takes him to blank page 

then when he restart page , takes him to empty cart , but invoice already created as unpaid in his account

when i showed errors and try log in to my admin panel i found error 

i installed radis and tried to clear cache and restart whmcs and radis and everything but still i have the same issue !