From 679a9d9ac9579bd18225409d85ed4870fb6c9c62 Mon Sep 17 00:00:00 2001
From: cridemichel <cristiano.demichele@gmail.com>
Date: Thu, 23 Jan 2020 17:06:44 +0100
Subject: [PATCH] Block ProcessFile from processing unloaded or nonexistant
 buffers (#589)

---
 autoload/tagbar.vim | 11 +++++++++++
 1 file changed, 11 insertions(+)

diff --git a/autoload/tagbar.vim b/autoload/tagbar.vim
index 7b2a7dc..e063083 100644
--- a/autoload/tagbar.vim
+++ b/autoload/tagbar.vim
@@ -1148,6 +1148,17 @@ function! s:ProcessFile(fname, ftype) abort
         return
     endif
 
+    let l:bufnum = bufnr(a:fname)
+
+    if !bufloaded(l:bufnum)
+        call tagbar#debug#log('[ProcessFile] Buffer is not loaded exiting...')
+        return
+    endif
+    if !bufexists(l:bufnum)
+        call tagbar#debug#log('[ProcessFile] Buffer does not exist exiting...')
+        return
+    endif
+
     let typeinfo = s:known_types[a:ftype]
 
     " If the file has only been updated preserve the fold states, otherwise