E539: Illegal character <,>

[rickalex21]

Self Checks

• [X ] I'm using the latest lualine.
• [X ] I didn't find the issue in existing issues or PRs.

How to reproduce the problem

Using fzf.vim with ripgrep when this line of code is in the config causes the error.
The commented out line does not cause the error:

" let spec = {'options': ['--phony', '--query', query, '--bind', 'change:reload:'.reload_command]}
	let spec = {'options': ['--preview-window','up,75%,border-bottom,+{2}+3/3,~3','--phony', '--query', query, '--bind', 'change:reload:'.reload_command]}
	call fzf#vim#grep(initial_command, 1, fzf#vim#with_preview(spec), fullscreen)

Expected behaviour

No errors

Actual behaviour

It's giving an error about a comma. Not sure what lualine has to do with fzf?
A lot of it mentions nvim_win_set_option and vim.schedule.

Error executing vim.schedule lua callback: ...vim/plugged/lualine.nvim/lua/lualine/utils/nvim_opts.lua:77: E539: Illegal character <,>             
stack traceback:                                                                                                                                   
        [C]: in function 'nvim_win_set_option'                                                                                                     
        ...vim/plugged/lualine.nvim/lua/lualine/utils/nvim_opts.lua:77: in function 'setter_fn'                                                    
        ...vim/plugged/lualine.nvim/lua/lualine/utils/nvim_opts.lua:50: in function 'set_opt'                                                      
        ...vim/plugged/lualine.nvim/lua/lualine/utils/nvim_opts.lua:74: in function 'set'                                                          
        ...itchie/.config/nvim/plugged/lualine.nvim/lua/lualine.lua:432: in function 'refresh'                                                     
        ...itchie/.config/nvim/plugged/lualine.nvim/lua/lualine.lua:353: in function <...itchie/.config/nvim/plugged/lualine.nvim/lua/lualine.lua:3
52>                           
Press ENTER or type command to continue                                                                                                            
Error executing vim.schedule lua callback: ...vim/plugged/lualine.nvim/lua/lualine/utils/nvim_opts.lua:77: E539: Illegal character <,>             
stack traceback:                                                                                                                                   
        [C]: in function 'nvim_win_set_option'                                                                                                     
        ...vim/plugged/lualine.nvim/lua/lualine/utils/nvim_opts.lua:77: in function 'setter_fn'                                                    
        ...vim/plugged/lualine.nvim/lua/lualine/utils/nvim_opts.lua:50: in function 'set_opt'                                                      
        ...vim/plugged/lualine.nvim/lua/lualine/utils/nvim_opts.lua:74: in function 'set'                                                          
        ...itchie/.config/nvim/plugged/lualine.nvim/lua/lualine.lua:432: in function 'refresh'                                                     
        ...itchie/.config/nvim/plugged/lualine.nvim/lua/lualine.lua:353: in function <...itchie/.config/nvim/plugged/lualine.nvim/lua/lualine.lua:3
52>    

[sudomyju]

I don't use fzf, but I have the bug as well, it started to pop up after configuring in bufferline.nvim to second lualine.

This is the usual pattern in logs after the lualine become absolutely useless ...

Error executing vim.schedule lua callback: ...e/nvim/lazy/lualine.nvim/lua/lualine/utils/nvim_opts.lua:77: E539: Illegal character < >
stack traceback:
        [C]: in function 'nvim_win_set_option'
        ...e/nvim/lazy/lualine.nvim/lua/lualine/utils/nvim_opts.lua:77: in function 'setter_fn'
        ...e/nvim/lazy/lualine.nvim/lua/lualine/utils/nvim_opts.lua:50: in function 'set_opt'
        ...e/nvim/lazy/lualine.nvim/lua/lualine/utils/nvim_opts.lua:74: in function 'set'
        ...e/su/.local/share/nvim/lazy/lualine.nvim/lua/lualine.lua:432: in function 'refresh'
        ...e/su/.local/share/nvim/lazy/lualine.nvim/lua/lualine.lua:353: in function <...e/su/.local/share/nvim/lazy/lualine.nvim/lua/lualine.lua:352>
Error executing vim.schedule lua callback: ...share/nvim/lazy/lualine.nvim/lua/lualine/utils/utils.lua:211: lualine: Failed to refresh statusline:
...e/nvim/lazy/lualine.nvim/lua/lualine/utils/nvim_opts.lua:77: E539: Illegal character < >
stack traceback:
        [C]: in function 'error'
        ...share/nvim/lazy/lualine.nvim/lua/lualine/utils/utils.lua:211: in function ''
        vim/_editor.lua: in function <vim/_editor.lua:0>

[sudomyju]

is there some way to restart lualine and perhaps some easy way to debug it?

[LordMZTE]

I also managed to reproduce this with a custom component, but it's not consistent unfortunately. I'm unsure what exactly causes it.

Update: I've found out that this is caused by an invalid percent escape sequence such as %, being returned by a component. This means that I believe this to be a bug in the implementation of the respective component.