fixed issue magento#18082

Author: shubham sharma

app/code/Magento/ConfigurableProduct/view/adminhtml/web/js/variations/variations.js

@@ -406,17 +406,20 @@ define([
          *   - configurable-matrix-serialized;
          *   - associated_product_ids_serialized.
          */
-        serializeData: function () {
-            this.source.data['configurable-matrix-serialized'] =
-                JSON.stringify(this.source.data['configurable-matrix']);
-
-            delete this.source.data['configurable-matrix'];
-
-            this.source.data['associated_product_ids_serialized'] =
-                JSON.stringify(this.source.data['associated_product_ids']);
-
-            delete this.source.data['associated_product_ids'];
-        },
+         serializeData: function () {
+             this.source.data['configurable-matrix-serialized'] =
+                 JSON.stringify(this.source.data['configurable-matrix']);
+             if ($('.admin__field-error').length===0) {
+                 delete this.source.data['configurable-matrix'];
+             }
+
+
+             this.source.data['associated_product_ids_serialized'] =
+                 JSON.stringify(this.source.data['associated_product_ids']);
+             if ($('.admin__field-error').length===0) {
+                 delete this.source.data['associated_product_ids'];
+             }
+         },
 
         /**
          * Check for newly added attributes