Bug gefixt, der durch das TimeStamp-Objekt zustande kam.

ChatController/Utilities/Utils.cs

@@ -44,6 +44,7 @@ namespace ChatController.Utilities
         private static void DownloadImage(string uri, Action<ImageSource> callback)
         {
             var client = new RestClient(uri);
+
             var request = new RestRequest
             {
                 ResponseWriter = stream =>
@@ -473,42 +474,49 @@ namespace ChatController.Utilities
             request.Headers[Constants.Token] = AuthToken;
             request.Headers[Constants.CustomerId] = Tenant;
 
-            using(var response = request.GetResponse())
+            try
             {
-                var responseStream = response.GetResponseStream();
-
-                if(responseStream is null)
+                using(var response = request.GetResponse())
                 {
-                    return null;
-                }
+                    var responseStream = response.GetResponseStream();
 
-                var rotation = Rotation.Rotate0;
-
-                using(var image = Image.FromStream(responseStream))
-                {
-                    if(image.PropertyIdList.Contains(0x112))
+                    if(responseStream is null)
                     {
-                        rotation = GetRotationFromExifTag(image.GetPropertyItem(0x112).Value[0]);
+                        return null;
                     }
 
-                    var bitmap = new BitmapImage();
+                    var rotation = Rotation.Rotate0;
 
-                    var localStream = new MemoryStream();
+                    using(var image = Image.FromStream(responseStream))
+                    {
+                        if(image.PropertyIdList.Contains(0x112))
+                        {
+                            rotation = GetRotationFromExifTag(image.GetPropertyItem(0x112).Value[0]);
+                        }
 
-                    image.Save(localStream, image.RawFormat);
+                        var bitmap = new BitmapImage();
 
-                    localStream.Position = 0;
+                        var localStream = new MemoryStream();
 
-                    bitmap.BeginInit();
-                    bitmap.StreamSource = localStream;
-                    bitmap.Rotation = rotation;
-                    bitmap.EndInit();
-                    bitmap.Freeze();
+                        image.Save(localStream, image.RawFormat);
 
-                    cache.AddAvatar(uri, bitmap, userId, groupId);
-                    return cache.GetAvatar(uri, userId, groupId);
+                        localStream.Position = 0;
+
+                        bitmap.BeginInit();
+                        bitmap.StreamSource = localStream;
+                        bitmap.Rotation = rotation;
+                        bitmap.EndInit();
+                        bitmap.Freeze();
+
+                        cache.AddAvatar(uri, bitmap, userId, groupId);
+                        return cache.GetAvatar(uri, userId, groupId);
+                    }
                 }
             }
+            catch(Exception exception)
+            {
+                return null;
+            }
         }
     }
 }