diff --git a/security/Security.php b/security/Security.php
index b532673db..536b06812 100644
--- a/security/Security.php
+++ b/security/Security.php
@@ -124,7 +124,7 @@ class Security extends Controller {
 		if(Member::currentUserID()) {
 			// user_error( 'PermFailure with member', E_USER_ERROR );
 
-			$message = $messageSet['alreadyLoggedIn']
+			$message = isset($messageSet['alreadyLoggedIn'])
 										? $messageSet['alreadyLoggedIn']
 										: $messageSet['default'];