diff --git a/autoload/lightline/colorscheme.vim b/autoload/lightline/colorscheme.vim
index 7bcbc83..5027d02 100644
--- a/autoload/lightline/colorscheme.vim
+++ b/autoload/lightline/colorscheme.vim
@@ -3,7 +3,7 @@
 " Version: 0.0
 " Author: itchyny
 " License: MIT License
-" Last Change: 2015/01/17 12:51:08.
+" Last Change: 2015/02/15 08:47:11.
 " =============================================================================
 
 let s:save_cpo = &cpo
@@ -212,7 +212,7 @@ function! lightline#colorscheme#flatten(p) abort
     for l in values(k)
       for m in range(len(l))
         let attr = ""
-        if len(l[m]) == 3
+        if len(l[m]) == 3 && type(l[m][2]) == 1
           let attr = l[m][2]
         endif
         let l[m] = [l[m][0][0], l[m][1][0], l[m][0][1], l[m][1][1]]