Page refresh error in CSharp

Hello everyone.
I am working on a plugin and I added a list for control purposes, when I call the list it comes without any problems, but when I call it again when it is closed, I get an error, can you give me advice on this?

20221203_130811

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I think you’re better off asking this question on other forums.

My knowledge of csharp is not that high, but shouldn’t you let it close?

You are right, I am closing, but I keep getting the same error, so I left that part blank. As you said, maybe I can get an answer to my question on other form sites. I just think I missed something simple :slight_smile:

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