attempt to fix https://wordpress.org/support/topic/fatal-error-on-lazy-load-is-breaking-woocommerce-add-to-cart-for-mix-and-match/

Author: selul

.github/workflows/test-php.yml

@@ -41,7 +41,7 @@ jobs:
         - name: Setup PHP version
           uses: shivammathur/setup-php@v2
           with:
-            php-version: ${{ matrix.php-version }}
+            php-version: ${{ matrix.php-versions }}
             extensions: simplexml, mysql
             tools: phpunit-polyfills:1.1
         - name: Checkout source code

inc/lazyload_replacer.php

@@ -115,7 +115,7 @@ public static function get_background_lazyload_selectors() {
 			return self::$background_lazyload_selectors;
 		}
 
-		if ( ! isset( self::instance()->settings ) ) {
+		if ( self::instance()->settings === null ) {
 			self::$background_lazyload_selectors = [];
 
 			return self::$background_lazyload_selectors;