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Unhandled Exception error when exiting ACT


I've been getting the below error when I exit out of ACT. ACT opens and runs fine, it's only when I exit out of ACT that this happens. As such it doesn't really impact my use of ACT, but still it would be nice to fix it if possible.

I only use ACT for FFXIV.
Application-Close 2021-05-13T10:33:06 UserClosing
***** 2021-05-13T10:33:06 - Entering SaveNewSettings
***** 2021-05-13T10:33:06 - Exiting SaveNewSettings: 67
***** 2021-05-13T10:33:06 - Unhandled Exception
System.InvalidOperationException - Invoke or BeginInvoke cannot be called on a control until the window handle has been created.
   at System.Windows.Forms.Control.MarshaledInvoke(Control caller, Delegate method, Object[] args, Boolean synchronous)
   at System.Windows.Forms.Control.BeginInvoke(Delegate method, Object[] args)
   at System.Windows.Forms.WindowsFormsSynchronizationContext.Post(SendOrPostCallback d, Object state)
   at System.Threading.Tasks.AwaitTaskContinuation.RunCallback(ContextCallback callback, Object state, Task& currentTask)
--- End of stack trace from previous location where exception was thrown ---
   at System.Runtime.ExceptionServices.ExceptionDispatchInfo.Throw()
   at System.Threading.ExecutionContext.RunInternal(ExecutionContext executionContext, ContextCallback callback, Object state, Boolean preserveSyncCtx)
   at System.Threading.ExecutionContext.Run(ExecutionContext executionContext, ContextCallback callback, Object state, Boolean preserveSyncCtx)
   at System.Threading.QueueUserWorkItemCallback.System.Threading.IThreadPoolWorkItem.ExecuteWorkItem()
   at System.Threading.ThreadPoolWorkQueue.Dispatch()

System.Windows.Forms.Control, System.Windows.Forms, Version=, Culture=neutral, PublicKeyToken=b77a5c561934e089

Thank you for any help or insight that you can provide.


  • ACT doesn't use await on tasks, so my assumption is a plugin is causing this.  Essentially the error message is saying a window is being used that doesn't exist.  You're closing ACT, so the window was probably destroyed as it was terminating.
  • Based on your comment, I started disabling plugins one by one and found which one was causing that error. I had just built a new computer and reinstalled ACT and all the plugins as well, so it seems like the latest version of that plugin was causing it. I rolled it back to an older version and it's fine now.

    If anyone else runs into this problem, it was caused by ACT_DiscordTriggers v1.0.2.0. Rolled back to

    Thanks for your help!
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