Merge pull request #1989 from Haendlerbund/bugfix-types-having-variants-pr-1798

Bugfix: Exception while applying catalog rule

packages/Webkul/Product/src/Helpers/ProductType.php

@@ -28,6 +28,7 @@ class ProductType extends AbstractProduct
      */
     public static function getAllTypesHavingVariants(): array
     {
+        $havingVariants = [];
         foreach (config('product_types') as $type) {
             if (self::hasVariants($type['key'])) {
                 array_push($havingVariants, $type['key']);