check undefined index

diff --git a/include/compat.inc.php b/include/compat.inc.php
index 2c74ec510f7c5ca2f9190029480d7e5532b6a19c..7590ac6fa1d74fbf9cc2145cdb3c9c78f515b324 100644 (file)
--- a/include/compat.inc.php
+++ b/include/compat.inc.php
@@ -108,7 +108,7 @@ $serendipity['COOKIE'] = &$_COOKIE['serendipity'];
 
 // Attempt to fix IIS compatibility
 if (empty($_SERVER['REQUEST_URI'])) {
-    $_SERVER['REQUEST_URI'] = $_SERVER['SCRIPT_NAME'] . '?' . $_SERVER['QUERY_STRING'];
+    $_SERVER['REQUEST_URI'] = $_SERVER['SCRIPT_NAME'] . '?' . (!empty($_SERVER['QUERY_STRING']) ? $_SERVER['QUERY_STRING'] : '');
 }
 
 // Some security issues