neo vim 的配置抛出索引 nil 值错误

问：

我做了这个 neo vim 设置，但每当我尝试用它打开 python 文件时，我都会收到这个错误。

这是错误：Error executing vim.schedule lua callback: /Users/~/.config/nvim/lua/core/utils.lua:80: attempt to index a nil value stack traceback: /Users/~/.config/nvim/lua/core/utils.lua:80: in function </Users/~/.config/nvim/lua/core/utils.lua:55>

下面是它引用的函数：

M.load_mappings = function(section, mapping_opt)
  vim.schedule(function()
    local function set_section_map(section_values)
      if section_values.plugin then
        return
      end

      section_values.plugin = nil

      for mode, mode_values in pairs(section_values) do
        local default_opts = merge_tb("force", { mode = mode }, mapping_opt or {})
        for keybind, mapping_info in pairs(mode_values) do
          -- merge default + user opts
          local opts = merge_tb("force", default_opts, mapping_info.opts or {})

          mapping_info.opts, opts.mode = nil, nil
          opts.desc = mapping_info[2]

          vim.keymap.set(mode, keybind, mapping_info[1], opts)
        end
      end
    end

    local mappings = require("core.utils").load_config().mappings

    if type(section) == "string" then
      mappings[section]["plugin"] = nil
      mappings = { mappings[section] }
    end

    for _, sect in pairs(mappings) do
      set_section_map(sect)
    end
  end)
end