diff --git a/editor/js/Storage.js b/editor/js/Storage.js
index f6c4a9f6983d8d255acc8eed666e0846f6503ee6..42a9cee983177c26a6b0b7db9b707ad044728a72 100644
--- a/editor/js/Storage.js
+++ b/editor/js/Storage.js
@@ -80,6 +80,8 @@ var Storage = function () {
 
 		clear: function () {
 
+			if ( database === undefined ) return;
+
 			var transaction = database.transaction( [ 'states' ], 'readwrite' );
 			var objectStore = transaction.objectStore( 'states' );
 			var request = objectStore.clear();