diff --git a/autoload/airline/highlighter.vim b/autoload/airline/highlighter.vim
index a38d93a..6af3207 100644
--- a/autoload/airline/highlighter.vim
+++ b/autoload/airline/highlighter.vim
@@ -72,6 +72,7 @@ function! airline#highlighter#exec(group, colors)
   if len(colors) == 4
     call add(colors, '')
   endif
+  let colors = s:CheckDefined(colors)
   if old_hi != colors
     let cmd = printf('hi %s %s %s %s %s %s %s %s',
         \ a:group, s:Get(colors, 0, 'guifg=', ''), s:Get(colors, 1, 'guibg=', ''),
@@ -82,6 +83,24 @@ function! airline#highlighter#exec(group, colors)
   endif
 endfunction
 
+function! s:CheckDefined(colors)
+  " Checks, whether the definition of the colors is valid and is not empty or NONE
+  " e.g. if the colors would expand to this:
+  " hi airline_c ctermfg=NONE ctermbg=NONE
+  " that means to clear that highlighting group, therefore, add a special term=NONE
+  " argument
+  for val in a:colors
+    if !empty(val) && val !=# 'NONE'
+      return a:colors
+    endif
+  endfor
+  " this adds the bold attribute to the term argument of the :hi command,
+  " but at least this makes sure, the group will be defined
+  let fg = synIDattr(synIDtrans(hlID('Normal')), 'fg', 'cterm')
+  let bg = synIDattr(synIDtrans(hlID('Normal')), 'bg', 'cterm')
+  return a:colors[0:1] + [fg, bg] + [a:colors[4]]
+endfunction
+
 function! s:Get(dict, key, prefix, default)
   if get(a:dict, a:key, a:default) isnot# a:default
     return a:prefix. get(a:dict, a:key)