diff --git a/common.inc.php b/common.inc.php
index 08d5f6f9..8e8cbe0b 100644
--- a/common.inc.php
+++ b/common.inc.php
@@ -492,8 +492,7 @@ global $config;
 <div id="footer">
 <? 
 //we only show the debug session variables if we have an ODD numbered version.
-$lastdigit=$config['version'][strlen($config['version'])-1];
-if($lastdigit%2!=0)
+if(substr($config['version'], -1) % 2 != 0)
 {
 	echo "DEBUG:";
 	print_r($_SESSION);