From 64f77c77fd6e0890b8df15a2a7fc05f6621e4719 Mon Sep 17 00:00:00 2001
From: Randy Morgan <digital.ipseity@gmail.com>
Date: Wed, 22 Aug 2012 17:21:26 +0900
Subject: do not parse auto_filter if there is no range specified

---
 lib/axlsx/workbook/worksheet/auto_filter.rb | 1 +
 1 file changed, 1 insertion(+)

diff --git a/lib/axlsx/workbook/worksheet/auto_filter.rb b/lib/axlsx/workbook/worksheet/auto_filter.rb
index efc6e942..7d9fbcfc 100644
--- a/lib/axlsx/workbook/worksheet/auto_filter.rb
+++ b/lib/axlsx/workbook/worksheet/auto_filter.rb
@@ -27,6 +27,7 @@ module Axlsx
     # serialize the object
     # @return [String]
     def to_xml_string(str='')
+      return unless range
       str << "<autoFilter ref='#{range}'></autoFilter>"
     end
 
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