1 files changed, 8 insertions, 4 deletions
diff --git a/vim/after/ftplugin/sh/bash_han.vim b/vim/after/ftplugin/sh/bash_han.vim
index c1997d7e..a160165c 100644
--- a/vim/after/ftplugin/sh/bash_han.vim
+++ b/vim/after/ftplugin/sh/bash_han.vim
@@ -4,12 +4,16 @@ if exists('b:did_ftplugin_sh_bash_han') || &compatible
   finish
 endif
 let b:did_ftplugin_sh_bash_han = 1
-let b:undo_ftplugin = b:undo_ftplugin
-      \ . '|unlet b:did_ftplugin_sh_bash_han'
+if exists('b:undo_ftplugin')
+  let b:undo_ftplugin = b:undo_ftplugin
+        \ . '|unlet b:did_ftplugin_sh_bash_han'
+endif
 
 " Use han(1df) as a man(1) wrapper for Bash files if available
 if exists('b:is_bash') && executable('han')
   setlocal keywordprg=han
-  let b:undo_ftplugin = b:undo_ftplugin
-        \ . '|setlocal keywordprg<'
+  if exists('b:undo_ftplugin')
+    let b:undo_ftplugin = b:undo_ftplugin
+          \ . '|setlocal keywordprg<'
+  endif
 endif