diff --git a/lua/lib/renderer.lua b/lua/lib/renderer.lua
index d2ed6b31..376c6754 100644
--- a/lua/lib/renderer.lua
+++ b/lua/lib/renderer.lua
@@ -279,8 +279,11 @@ end
 
 local M = {}
 
+function is_bufnr_valid(bufnr)
+  return vim.fn.bufexists(bufnr) == 1
+end
 function M.draw(tree, reload)
-  if not tree.bufnr then return end
+  if not is_bufnr_valid(tree.bufnr) then return end
   api.nvim_buf_set_option(tree.bufnr, 'modifiable', true)
   local cursor = api.nvim_win_get_cursor(tree.winnr())
   if reload then
@@ -300,7 +303,7 @@ function M.draw(tree, reload)
 end
 
 function M.render_hl(bufnr)
-  if not bufnr then return end
+  if not is_bufnr_valid(bufnr) then return end
   api.nvim_buf_clear_namespace(bufnr, namespace_id, 0, -1)
   for _, data in ipairs(hl) do
     api.nvim_buf_add_highlight(bufnr, namespace_id, data[1], data[2], data[3], data[4])