Barbar disables itself after an error

[sawa-ko]

Preamble (you can delete this section):

• Are you using a recent build (november 2020 & up) of neovim 0.5?
• If not, rebuild it now before reporting the issue.
• Do you certify having read the readme or are ready for being shamed for not having read the manual?

Description

Every time I use the PackerSync command and press Q to close the Packer window I get that error message and the bar stops working. I don't understand what is going on.

To Reproduce

init.lua:

return require('packer').startup(function(use)
    use {
        'romgrk/barbar.nvim',
        requires = {'kyazdani42/nvim-web-devicons'},
        config = function()
            vim.g.bufferline = {
                animation = true,
                closable = true,
                clickable = true
            }
        end
    }
end)

Steps to reproduce the behavior:

1. Install plugin
2. run PackerSync

Screenshots

Informations Neovim version: 0.7.2

[Iron-E]

Dupe of https://github.com/romgrk/barbar.nvim/issues/218#issuecomment-1139962844