From e88586e1b26ac60db014c1d3cb3eb02c545c7a2e Mon Sep 17 00:00:00 2001
From: Jesse Luehrs <doy@tozt.net>
Date: Sun, 22 May 2016 03:36:56 -0400
Subject: ensure _color always returns a single item

---
 lib/Spreadsheet/ParseXLSX.pm | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/lib/Spreadsheet/ParseXLSX.pm b/lib/Spreadsheet/ParseXLSX.pm
index cf9319a..26e591e 100644
--- a/lib/Spreadsheet/ParseXLSX.pm
+++ b/lib/Spreadsheet/ParseXLSX.pm
@@ -921,7 +921,7 @@ sub _color {
                 $color = "#$theme";
             }
             else {
-                return;
+                return undef;
             }
         }
 
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