Error when redoing new clipping created by drag 'n drop

[aecreations]

Clippings 6.5.3 on Firefox 123.0.1

Steps to repro:

1. In a text editor, select some text
2. In Firefox, open Clippings Manager
3. Drag the selected text from the text editor into the Clippings Manager tree list, and drop it in the desired location to create a clipping
4. Click Undo
5. Press F2 to redo

Result: The following error appears in the error console: "DataError: No valid key or key range specified."

[aecreations]

To fix this issue, port the following code change from Clippings for Thunderbird 7.0 - aecreations/clippings-tb@5eecbf6