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Error : Error: Call to a member function getVar() on string

Backtrace:
/modules/cart/class/product.php (124)
/modules/cart/controllers/product.php (158)
/modules/cart/core/MY_Controller.php (148)
/modules/mesakfr/core/Mesakfr.php (327)
/modules/mesakfr/core.php (80)
/modules/cart/index.php (14)