fix: application will raise an error when selecting unsplash image in…

… local mode (AppFlowy-IO#4604)

frontend/appflowy_flutter/lib/shared/appflowy_network_image.dart

@@ -2,6 +2,7 @@ import 'dart:convert';
 
 import 'package:appflowy/shared/custom_image_cache_manager.dart';
 import 'package:appflowy/util/string_extension.dart';
+import 'package:appflowy_backend/log.dart';
 import 'package:appflowy_backend/protobuf/flowy-user/protobuf.dart';
 import 'package:cached_network_image/cached_network_image.dart';
 import 'package:flutter/material.dart';
@@ -56,7 +57,12 @@ class FlowyNetworkImage extends StatelessWidget {
     final header = <String, String>{};
     final token = userProfilePB?.token;
     if (token != null) {
-      header['Authorization'] = 'Bearer ${jsonDecode(token)['access_token']}';
+      try {
+        final decodedToken = jsonDecode(token);
+        header['Authorization'] = 'Bearer ${decodedToken['access_token']}';
+      } catch (e) {
+        Log.error('unable to decode token: $e');
+      }
     }
     return header;
   }