From b86a37caf7a4e53e62ba883aef5889b590260de9 Mon Sep 17 00:00:00 2001
From: Tomasz N <przepompownia@users.noreply.github.com>
Date: Sun, 22 May 2022 17:30:53 +0200
Subject: fix: buffer may be invalid during on_attach #1822

on_attach is a nontrivial callback so it makes sense to check the bufnr.
---
 lua/lspconfig/configs.lua | 18 ++++++++++--------
 1 file changed, 10 insertions(+), 8 deletions(-)

(limited to 'lua')

diff --git a/lua/lspconfig/configs.lua b/lua/lspconfig/configs.lua
index 49bac987..ab86055d 100644
--- a/lua/lspconfig/configs.lua
+++ b/lua/lspconfig/configs.lua
@@ -180,15 +180,17 @@ function configs.__newindex(t, config_name, config_def)
         if bufnr == api.nvim_get_current_buf() then
           M._setup_buffer(client.id, bufnr)
         else
-          api.nvim_command(
-            string.format(
-              "autocmd BufEnter <buffer=%d> ++once lua require'lspconfig'[%q]._setup_buffer(%d,%d)",
-              bufnr,
-              config_name,
-              client.id,
-              bufnr
+          if vim.api.nvim_buf_is_valid(bufnr) then
+            api.nvim_command(
+              string.format(
+                "autocmd BufEnter <buffer=%d> ++once lua require'lspconfig'[%q]._setup_buffer(%d,%d)",
+                bufnr,
+                config_name,
+                client.id,
+                bufnr
+              )
             )
-          )
+          end
         end
       end)
 
-- 
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