Failed to compare two elements in the array

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VB

threads

I get "Failed to compare two elements in the array" error when I run the following code:

Private Sub BoyamaGradyan(args())
Dim args2count, args4count As Integer
DirectCast(args(0), Object).Dispatcher.Invoke(DirectCast(Sub()
                                                   args2count = args(2).count
                                                   args4count = args(4).count
                                                        End Sub, Action))
...
...
End Sub

This code runs under an external thread, that's why I copy args(2).count and args(4).count. Otherwise I cannot access them because they belong to the main thread.

args(2) and args(4) are GradientColorBrushes, args(0) is a label.
Here, you can see the types of all variables related to this issue:
https://onedrive.live.com/?cid=040217060d2a6ab3&id=40217060D2A6AB3%215784&v=3&ithint=photo,PNG&authkey=!AHIEIyv1pPWscGA[^]

Error does not happen everytime I run this code. Happens only when I call this code again and again quickly even though I abort the thread when it's already running and called again. How can I get rid of it?

Thanks in advance

Edit: I have just realized that this error is also thrown when I call update() sub which I use to return results to the main thread. Therefore, I think this could be thrown at any Dispatcher.invoke sub I call