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Hello everyone. The problem is this: when trying to copy a custom table of contents from one file to another, indesigne crashes. And such a window appears as in the screenshot
I have no idea why this happens to you.
To work around the issue I would try to:
 export the text frame holding the table of contents to an IDMS snippet file.
To do that select the frame(s) and do export as InDesign-Snippet (*.idms)
 In the other document place the IDMS file that contains the exported frame(s).
( ACP )
Also, fill in the screen that you showed in your screenshot and send it to Adobe. That way they know about the problem and may fix it.
I hope your issue is resolved now.
We have just released Adobe InDesign 2021 (v16.1) with multiple stability & performance fixes. I'd request you to update your app to the latest version to improve the performance of the app. Let us know how it goes.