diff --git a/www/advertising.php b/www/advertising.php
index 3d7c639..0e7848b 100644
--- a/www/advertising.php
+++ b/www/advertising.php
@@ -27,8 +27,8 @@
 	$id = intval($_REQUEST['id']);
 	if($id == 2)
 		$id = 0;
-	$oldid = intval($_POST['oldid']);
-	$process = $_POST['process'];
+	$oldid = array_key_exists('oldid',$_POST)?intval($_POST['oldid']):0;
+	$process = array_key_exists('process',$_POST)?$_POST['process']:"";
 
 	loadem("account");
 	$errmsg = "";
@@ -48,24 +48,24 @@
 		{
 			$id = 1;
 			$errmsg .= _("You can only place an advertisement for up to 12 months.<br />");
-			unset($process);
-			unset($oldid);
+			$process="";
+			$oldid=0;
 		}
 
 		if(strlen($title) <= 5)
 		{
 			$id = 1;
 			$errmsg .= _("Link title was too short.<br />");
-			unset($process);
-			unset($oldid);
+			$process="";
+			$oldid=0;
 		}
 
 		if(strlen($link) <= 10)
 		{
 			$id = 1;
 			$errmsg .= _("Link URI was too short.<br />");
-			unset($process);
-			unset($oldid);
+			$process="";
+			$oldid=0;
 		}
 	}