fix random looping bug with old credentials

management/lib/widgets/auth_guard.dart

+import 'dart:io';
+
 import 'package:flutter/material.dart';
+import 'package:path_provider/path_provider.dart';
 import 'package:provider/provider.dart';
 
 import '../api/auth_api.dart';
@@ -20,7 +23,9 @@ class _AuthGuardState extends State<AuthGuard> {
     if (_authApi!.user?.credentials?.expiration?.isAfter(DateTime.now()) ?? false) {
       return widget.child;
     } else {
-      Future.delayed(const Duration(milliseconds: 200)).then((value) {
+      Future.delayed(const Duration(milliseconds: 200)).then((value) async {
+        final basePath = (await getApplicationDocumentsDirectory()).path;
+        await File('$basePath/credentials').delete();
         //Navigator.of(context).popUntil((route) => route.settings.name == '/');
         Navigator.of(context).popAndPushNamed('/login');
       });