fzf-lua/providers/buffers.lua:219: assertion failed!

[phanen]

I cannot stably reproduce, but I occasionally get this:

vim.schedule callback: /home/phan/b/fzf-lua/lua/fzf-lua/shell.lua:440: /home/phan/b/fzf-lua/lua/fzf-lua/providers/buffers.lua:219: assertion failed!
stack traceback:
	[C]: in function 'assert'
	/home/phan/b/fzf-lua/lua/fzf-lua/providers/buffers.lua:219: in function 'contents'
	/home/phan/b/fzf-lua/lua/fzf-lua/shell.lua:435: in function </home/phan/b/fzf-lua/lua/fzf-lua/shell.lua:430>
	[C]: in function 'xpcall'
	/home/phan/b/fzf-lua/lua/fzf-lua/shell.lua:430: in function 'fn'
	/home/phan/b/fzf-lua/lua/fzf-lua/shell.lua:151: in function </home/phan/b/fzf-lua/lua/fzf-lua/shell.lua:150>
stack traceback:
	[C]: in function 'error'
	/home/phan/b/fzf-lua/lua/fzf-lua/shell.lua:440: in function 'fn'
	/home/phan/b/fzf-lua/lua/fzf-lua/shell.lua:151: in function </home/phan/b/fzf-lua/lua/fzf-lua/shell.lua:150>

[phanen]

This happened in actions.buf_del (delete all the buffer except the current one). It will reload the picker.

Usually this happens when I load many buffer, and nvim run a long period of time.