diff --git a/security/MemberLoginForm.php b/security/MemberLoginForm.php
index 73747451c..3afa57923 100644
--- a/security/MemberLoginForm.php
+++ b/security/MemberLoginForm.php
@@ -100,7 +100,7 @@ class MemberLoginForm extends LoginForm {
 			Session::clear('SessionForms.MemberLoginForm.Email');
 			Session::clear('SessionForms.MemberLoginForm.Remember');
 
-			if($backURL = $_REQUEST['BackURL']) {
+			if(isset($_REQUEST['BackURL']) && $backURL = $_REQUEST['BackURL']) {
 				Session::clear("BackURL");
 				Director::redirect($backURL);
 			} else {