From e4389ff5641192c3d12ed1df956954c29fcb38a4 Mon Sep 17 00:00:00 2001
From: Andrew Radev <andrey.radev@gmail.com>
Date: Mon, 28 Dec 2020 13:25:01 +0200
Subject: [PATCH] Dont't error out when "Normal" group is missing "bg"

---
 syntax/colddeck.vim | 11 ++++++++++-
 1 file changed, 10 insertions(+), 1 deletion(-)

diff --git a/syntax/colddeck.vim b/syntax/colddeck.vim
index e06e189..9020bfb 100644
--- a/syntax/colddeck.vim
+++ b/syntax/colddeck.vim
@@ -29,7 +29,16 @@ exe 'syn match  cdeckResSep   /\V'.get(g:, 'cdeck_rchar', '>').'/ contained'
 
 " Highlights
 
-hi cdeckInvisible guifg=bg guibg=bg ctermbg=bg ctermfg=bg
+try
+  hi cdeckInvisible guifg=bg guibg=bg ctermbg=bg ctermfg=bg
+catch /E420:/
+  " No "bg" set, let's try our best to hide it:
+  if &background == 'dark'
+    hi cdeckInvisible guifg=Black guibg=Black ctermbg=Black ctermfg=Black
+  elseif &background == 'light'
+    hi cdeckInvisible guifg=White guibg=White ctermbg=White ctermfg=White
+  endif
+endtry
 
 hi link    cdeckCommand   Normal
 hi link    cdeckCmdRef    Identifier