11532: Duplicate Simple Product Throws Error: Undefined offset: 0 in SaveHandler.php on line 122

Author: RomaKis

app/code/Magento/Catalog/Model/Category/Link/SaveHandler.php

@@ -119,8 +119,7 @@ private function mergeCategoryLinks($newCategoryPositions, $oldCategoryPositions
 
             if ($key === false) {
                 $result[] = $newCategoryPosition;
-            } elseif (
-                isset($oldCategoryPositions[$key])
+            } elseif (isset($oldCategoryPositions[$key])
                 && $oldCategoryPositions[$key]['position'] != $newCategoryPosition['position']
             ) {
                 $result[] = $newCategoryPositions[$key];