Warning: array_key_exists() expects parameter 2 to be array

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Hello. Sometimes, when I enter my website, I getting this warning:

Warning: array_key_exists() expects parameter 2 to be array, string given in /home/caauty/domains/camourbeauty.com/public_html/wp-content/plugins/hide-shipping-method-for-woocommerce/public/class-woo-hide-shipping-methods-public.php on line 260

My code starts from 260 line:

            if ( array_key_exists( 'general_rule_match', $cost_rule_match ) ) {
                $general_rule_match = $cost_rule_match['general_rule_match'];
            } else {
                $general_rule_match = 'any';
            }
        
        } else {
            $general_rule_match = 'any';
        }

How to fix it? Thanks!