From 50e5e86ac37ee3989a0015d3934c5a961012990a Mon Sep 17 00:00:00 2001
From: fdschmidt93 <39233597+fdschmidt93@users.noreply.github.com>
Date: Mon, 23 Aug 2021 20:20:41 +0200
Subject: [PATCH] fix: safer teardown of buffer previewer (#1158)

---
 lua/telescope/previewers/buffer_previewer.lua | 20 ++++++++++---------
 1 file changed, 11 insertions(+), 9 deletions(-)

diff --git a/lua/telescope/previewers/buffer_previewer.lua b/lua/telescope/previewers/buffer_previewer.lua
index 3ba7bac..1c393f5 100644
--- a/lua/telescope/previewers/buffer_previewer.lua
+++ b/lua/telescope/previewers/buffer_previewer.lua
@@ -921,15 +921,17 @@ previewers.buffers = defaulter(function(opts)
       return state
     end,
     teardown = function(self)
-      -- reapply proper buffer-window options..
-      for opt, value in pairs(self.state.win_options) do
-        vim.api.nvim_win_set_option(self.state.winid, opt, value)
-      end
-      -- TODO precautious clearing of extmark though likely no effect due to ephemeral
-      -- clear extmarks for previewed buffers
-      for buf, _ in pairs(self.state.previewed_buffers) do
-        if vim.api.nvim_buf_is_valid(buf) then
-          vim.api.nvim_buf_clear_namespace(buf, ns_previewer, 0, -1)
+      if self.state then
+        -- reapply proper buffer-window options..
+        for opt, value in pairs(self.state.win_options) do
+          vim.api.nvim_win_set_option(self.state.winid, opt, value)
+        end
+        -- TODO precautious clearing of extmark though likely no effect due to ephemeral
+        -- clear extmarks for previewed buffers
+        for buf, _ in pairs(self.state.previewed_buffers) do
+          if vim.api.nvim_buf_is_valid(buf) then
+            vim.api.nvim_buf_clear_namespace(buf, ns_previewer, 0, -1)
+          end
         end
       end
       previewer_active = false