Unusable when too many code actions

[Chaitanyabsprip]

I get the following error when I open lsp-fastaction floating window when there are larger number of code actions. I am coding in flutter and large number of code-actions is pretty common.

E5108: Error executing lua ...cker/opt/lsp-fastaction.nvim/lua/lsp-fastaction/init.lua:111: Expected lua string                                                         
stack traceback:
        [C]: in function 'nvim_buf_set_keymap'
        ...cker/opt/lsp-fastaction.nvim/lua/lsp-fastaction/init.lua:111: in function 'show_menu'
        ...cker/opt/lsp-fastaction.nvim/lua/lsp-fastaction/init.lua:149: in function 'request_code_action'
        ...cker/opt/lsp-fastaction.nvim/lua/lsp-fastaction/init.lua:158: in function 'code_action'
        [string ":lua"]:1: in main chunk