MC-41575: Magento Catalog Frontend Action Synchronizer 400 causes JS unhandled error

Author: yelahin-serhiy

lib/web/mage/utils/misc.js

@@ -178,13 +178,15 @@ define([
                     }
                 })
                 .fail(function () {
-                    config.response.status(undefined);
-                    config.response.status(false);
-                    config.response.data({
-                        error: true,
-                        messages: 'Something went wrong.',
-                        t: t
-                    });
+                    if (config.response) {
+                        config.response.status(undefined);
+                        config.response.status(false);
+                        config.response.data({
+                            error: true,
+                            messages: 'Something went wrong.',
+                            t: t
+                        });
+                    }
                 })
                 .always(function () {
                     if (!config.ignoreProcessEvents) {