FIX: show response data if availibale

frontend/src/main.js

@@ -307,7 +307,11 @@ async function init() {
   }
   window.addEventListener('unhandledrejection', function (event) {
     window.console.debug('unhanldedrejection handler triggered')
-    EventBus.$emit('error', event.reason)
+    if ('response' in event.reason) {
+      EventBus.$emit('error', event.reason.response.data)
+    } else {
+      EventBus.$emit('error', event.reason)
+    }
   })
   Axios.interceptors.response.use(
     function (response) {