nvim-treesitter-context Crash on empty first line when number line is on (markdown)

Description

With vim.opt.number = true, while editing a markdown file where the first line is empty, the plugin will crash when you have scrolled far down enough for the context line to trigger.

Neovim version

NVIM v0.9.5 Build type: Release LuaJIT 2.1.1713773202 system vimrc file: "$VIM/sysinit.vim" fall-back for $VIM: "/usr/share/nvim"

Expected behavior

Single empty context line on top

Actual behavior

Error detected while processing CursorMoved Autocommands for "*":                                                               
Error executing lua callback: /tmp/nvim/site/ts_context/lua/treesitter-context/render.lua:106: Could not apply exmtark to { -1, 0 }: Invalid 'line': out of range
stack traceback:
        [C]: in function 'error'
        /tmp/nvim/site/ts_context/lua/treesitter-context/render.lua:106: in function 'add_extmark'
        /tmp/nvim/site/ts_context/lua/treesitter-context/render.lua:235: in function 'highlight_bottom'
        /tmp/nvim/site/ts_context/lua/treesitter-context/render.lua:303: in function 'render_lno'
        /tmp/nvim/site/ts_context/lua/treesitter-context/render.lua:353: in function 'open'
        /tmp/nvim/site/ts_context/lua/treesitter-context.lua:50: in function 'open'
        /tmp/nvim/site/ts_context/lua/treesitter-context.lua:111: in function 'f'
        /tmp/nvim/site/ts_context/lua/treesitter-context.lua:27: in function </tmp/nvim/site/ts_context/lua/treesitter-context.lua:21>

Minimal config

local plugins = {
  ts         = 'https://github.com/nvim-treesitter/nvim-treesitter',
  ts_context = 'https://github.com/nvim-treesitter/nvim-treesitter-context',
}

for name, url in pairs(plugins) do
  local install_path = '/tmp/nvim/site/'..name
  if vim.fn.isdirectory(install_path) == 0 then
    vim.fn.system { 'git', 'clone', '--depth=1', url, install_path }
  end
  vim.o.runtimepath = install_path..','..vim.o.runtimepath
end

vim.opt.number = true