Undo-tree error reading history

[scame-mood]

What happened?

When I open my todo.org file it freezes for a bit. When it unfreezes the following error is printed in the echo area:

Error reading undo-tree history from "/home/user/.emacs.d/.local/cache/undo-tree-hist/.1d09356baaf2974f727a0889c0d6e5e3dab48f6d.~undo-tree~"

What did you expect to happen?

The file should open as normal with no error.

System information

Loading data dump...

[peterhoeg]

The cache file is corrupted. Just delete it and you should be good to go.

[scame-mood]

I deleted it. A couple hours later (and after reloading Emacs), the same error happened, with the same file name, i.e. I deleted that cache file and it seems to have been rewritten to.

I have already disabled undo-tree-enable-undo-in-region which I hear is buggy.

[scame-mood]

I have added (toggle-debug-on-error) to my config, but I get no backtrace before/after the error message appears. Any suggestions on how to find the source of this error?