From d2961a46777a98b5272bc60c52db0a81b8b8ea72 Mon Sep 17 00:00:00 2001
From: Jan Larres <jan@majutsushi.net>
Date: Mon, 31 Oct 2016 09:59:20 +1300
Subject: [PATCH] Check for nonexistent variable, closes #357

---
 autoload/tagbar.vim | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/autoload/tagbar.vim b/autoload/tagbar.vim
index 5ace4b8..a598849 100644
--- a/autoload/tagbar.vim
+++ b/autoload/tagbar.vim
@@ -1917,7 +1917,8 @@ function! s:OpenWindow(flags) abort
             " then that means that the window numbers have changed.
             " Just jump back to the previous window since we won't be able to
             " restore the window history.
-            if winnr() == pprevwinnr || winnr() == prevwinnr
+            if winnr() == prevwinnr
+             \ || (exists('pprevwinnr') && winnr() == pprevwinnr)
                 call s:goto_win('p')
             else
                 if exists('pprevwinnr')