fix(autocmds): buf invalid after vim.schedule

lua/lazyvim/config/autocmds.lua

@@ -74,6 +74,9 @@ vim.api.nvim_create_autocmd("FileType", {
   callback = function(event)
     vim.bo[event.buf].buflisted = false
     vim.schedule(function()
+      if not vim.api.nvim_buf_is_valid(event.buf) then
+        return
+      end
       vim.keymap.set("n", "q", function()
         vim.cmd("close")
         pcall(vim.api.nvim_buf_delete, event.buf, { force = true })