diff --git a/application/core/Maps/MapManager.php b/application/core/Maps/MapManager.php
index 21d73666..3ea5d8ed 100644
--- a/application/core/Maps/MapManager.php
+++ b/application/core/Maps/MapManager.php
@@ -245,7 +245,7 @@ class MapManager implements CallbackListener {
 	public function addMapFromMx($mapId, $login, $update = false) {
 		if (is_numeric($mapId)) {
 			// Check if map exists
-			$this->maniaControl->mapManager->mxManager->fetchMapInfo($mapId, function (MXMapInfo $mapInfo) use (&$login, &$update) {
+			$this->maniaControl->mapManager->mxManager->fetchMapInfo($mapId, function (MXMapInfo $mapInfo = null) use (&$login, &$update) {
 				if (!$mapInfo || !isset($mapInfo->uploaded)) {
 					// Invalid id
 					$this->maniaControl->chat->sendError('Invalid MX-Id!', $login);