diff --git a/source/Ox.UI/js/Core/Event.js b/source/Ox.UI/js/Core/Event.js
index 7042d9c6..a944d404 100644
--- a/source/Ox.UI/js/Core/Event.js
+++ b/source/Ox.UI/js/Core/Event.js
@@ -114,7 +114,10 @@
             resetTimeout = setTimeout(function() {
                 keys = '';
             }, 1000);
-            if (Ox.contains(keyboardCallbacks[0], event) || (
+            if ((
+                keyboardCallbacks[0]
+                && Ox.contains(keyboardCallbacks[0], event)
+            ) || (
                 $element && keyboardCallbacks[$element.oxid]
                 && Ox.contains(keyboardCallbacks[$element.oxid], event)
             )) {