MC-25187: Session lost after switching stores on different domains

Author: serhii-balko

app/code/Magento/Store/Controller/Store/Redirect.php

@@ -128,5 +128,7 @@ public function execute()
             ];
             $this->_redirect->redirect($this->_response, 'stores/store/switch', $arguments);
         }
+
+        return null;
     }
 }