From cb0483f54cccd5118baf5aaf86c2e33ccfa5ff3c Mon Sep 17 00:00:00 2001
From: Urban Müller
Date: Fri, 18 Oct 2013 14:17:00 +0000
Subject: additional check if headers can be modified

---
 itjs.class | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/itjs.class b/itjs.class
index c4e91d5..d2aba92 100644
--- a/itjs.class
+++ b/itjs.class
@@ -195,7 +195,7 @@ static function checksum($fnlist)
 	{
 		$origheaders = headers_list();
 		$result = it_cache::put($key, substr(md5(itjs::filecontents(is_array($fnlist) ? $fnlist : itjs::filenames($fnlist), false)), 0, 8));
-		if (headers_list() != $origheaders)
+		if (!headers_sent() && headers_list() != $origheaders)
 		{
 			header_remove();
 			foreach ($origheaders as $origheader)
-- 
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