diff --git a/plugin/fzf.vim b/plugin/fzf.vim
index ee0e41bb..6ebcc887 100644
--- a/plugin/fzf.vim
+++ b/plugin/fzf.vim
@@ -357,6 +357,8 @@ function! s:get_color(attr, ...)
     let code = synIDattr(synIDtrans(hlID(group)), a:attr, fam)
     if code =~? pat
       return code
+    elseif code == ''
+      return -1
     endif
   endfor
   return ''