Got error in Gitsigns blame_line

[Alienover]

Description

E5108: Error executing lua ...pack/packer/opt/plenary.nvim/lua/plenary/async/async.lua:14: The coroutine failed with this message: ...
e/pack/packer/opt/gitsigns.nvim/lua/gitsigns/actions.lua:494: attempt to index local 'opts0' (a nil value)

Neovim version

NVIM v0.5.1 Build type: Release

Operating system and version

macOS Monterey v12.0.1

Steps to reproduce

1. nvim xxx.txt
2. exectue :Gitsigns blame_line

Expected behavior

No response

Actual behavior

Gitsigns debug messages

No response

Minimal config

return require("packer").startup({
    function(use)

        -- Other plugins setup

        use({
            "lewis6991/gitsigns.nvim",
            opt = true,
            event = "BufReadPre",
            wants = "plenary.nvim",
            requires = { "nvim-lua/plenary.nvim" },
            config = function()
                require("gitsigns").setup({
                    signs = {
                        add = {
                            hl = "GitSignsAdd",
                            text = "▍",
                            numhl = "GitSignsAddNr",
                            linehl = "GitSignsAddLn",
                        },
                        change = {
                            hl = "GitSignsChange",
                            text = "▍",
                            numhl = "GitSignsChangeNr",
                            linehl = "GitSignsChangeLn",
                        },
                        delete = {
                            hl = "GitSignsDelete",
                            text = "▸",
                            numhl = "GitSignsDeleteNr",
                            linehl = "GitSignsDeleteLn",
                        },
                        topdelete = {
                            hl = "GitSignsDelete",
                            text = "▾",
                            numhl = "GitSignsDeleteNr",
                            linehl = "GitSignsDeleteLn",
                        },
                        changedelete = {
                            hl = "GitSignsChange",
                            text = "▍",
                            numhl = "GitSignsChangeNr",
                            linehl = "GitSignsChangeLn",
                        },
                    },
                    keymaps = {
                        -- Default keymap options
                        noremap = true,
                        buffer = true,
                        ["n ]c"] = {
                            expr = true,
                            "&diff ? ']c zz' : '<cmd>lua require\"gitsigns\".next_hunk()<CR> zz'",
                        },
                        ["n [c"] = {
                            expr = true,
                            "&diff ? '[c zz' : '<cmd>lua require\"gitsigns\".prev_hunk()<CR> zz'",
                        },
                        ["n <leader>ghs"] = '<cmd>lua require"gitsigns".stage_hunk()<CR>',
                        ["n <leader>ghu"] = '<cmd>lua require"gitsigns".undo_stage_hunk()<CR>',
                        ["n <leader>ghr"] = '<cmd>lua require"gitsigns".reset_hunk()<CR>',
                        ["n <leader>ghR"] = '<cmd>lua require"gitsigns".reset_buffer()<CR>',
                        ["n <leader>ghp"] = '<cmd>lua require"gitsigns".preview_hunk()<CR>',
                        ["n <leader>ghb"] = '<cmd>lua require"gitsigns".blame_line()<CR>',
                        -- Text objects
                        ["o ih"] = ':<C-U>lua require"gitsigns".select_hunk()<CR>',
                        ["x ih"] = ':<C-U>lua require"gitsigns".select_hunk()<CR>',
                    },
                })
            end,
        })
    end,
    config = {
        display = {
            open_fn = function()
                return require("packer.util").float(Utils.get_float_win_opts({
                    border = true,
                }))
            end,
        },
    },
})