From b54d8d64f126a6d600323d56ba1d2e0051b09d16 Mon Sep 17 00:00:00 2001
From: Jan Larres <jan@majutsushi.net>
Date: Tue, 14 Oct 2014 11:19:08 +1300
Subject: [PATCH] Handle unloaded buffers when getting prototype, closes #222

---
 autoload/tagbar.vim | 5 +++--
 1 file changed, 3 insertions(+), 2 deletions(-)

diff --git a/autoload/tagbar.vim b/autoload/tagbar.vim
index 2b555c3..3845651 100644
--- a/autoload/tagbar.vim
+++ b/autoload/tagbar.vim
@@ -1394,8 +1394,9 @@ function! s:NormalTag.getPrototype(short) abort dict
     else
         let bufnr = self.fileinfo.bufnr
 
-        if self.fields.line == 0
-            " No linenumber available, try the pattern instead
+        if self.fields.line == 0 || !bufloaded(bufnr)
+            " No linenumber available or buffer not loaded (probably due to
+            " 'nohidden'), try the pattern instead
             return substitute(self.pattern, '^\\V\\^\\C\s*\(.*\)\\$$', '\1', '')
         endif