PHPOpen Cart Turning Cache Off Broke Admin Section (vendor/scss.inc.php on line 1753) By Rahul Bhutani - December 28, 2021 0 703 Share Facebook Twitter Google+ Pinterest WhatsApp ...system\storage\vendor\scss.inc.php line 1753Replacing$key = $key[1];to$key = isset($key[1]) ? $key[1] : null; is worked for me in PHP 7.4 This code solved my problem