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

inc/lazyload_replacer.php

@@ -115,6 +115,11 @@ public static function get_background_lazyload_selectors() {
 			return self::$background_lazyload_selectors;
 		}
 
+		if ( ! isset( self::instance()->settings ) ) {
+			self::$background_lazyload_selectors = [];
+
+			return self::$background_lazyload_selectors;
+		}
 		if ( self::instance()->settings->get( 'bg_replacer' ) === 'disabled' ) {
 			self::$background_lazyload_selectors = [];
 			return self::$background_lazyload_selectors;