Error when opening mundo if undo history is in `undofile`/`undodir` about vim-mundo HOT 4 CLOSED

Can confirm, with a minimal vimrc

set nocompatible

call plug#begin('~/.vim/bundle')

Plug 'https://github.com/tpope/vim-sensible'
Plug 'https://github.com/simnalamburt/vim-mundo'

call plug#end()

You don't need to even write or close the file to trigger the error.

git bisect shows that it was broken by c0d814b from #122.

The workaround is just manually checkout the previous working commit in the plugin directory (assuming a plugin manager): 595ee33

from vim-mundo.

Fixed by 3c7e008

from vim-mundo.

Since every :PlugUpdate breaks this again, a slightly more permanent fix is to use my fork which I will keep at 595ee33 until this issue is fixed:

Plug 'TamaMcGlinn/vim-mundo'

I will delete my fork when this issue is fixed, so you get an error and will know to switch back.

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Thank you @simnalamburt, works great!

from vim-mundo.