Update BotBase.cs

- prevent BotBase from crashing on  loading serialized sessions

TelegramBotBase/BotBase.cs

@@ -539,10 +539,18 @@ namespace TelegramBotBase
 
                 this.Sessions.SessionList.Add(s.DeviceId, device);
 
+                try
+                {
                     await form.OnInit(new InitEventArgs());
 
                     await form.OnOpened(new EventArgs());
                 }
+                catch
+                {
+                    //Skip on exception
+                    this.Sessions.SessionList.Remove(s.DeviceId);
+                }
+            }
 
         }