diff --git a/src/dat/gui/GUI.js b/src/dat/gui/GUI.js
index 803ee1b..a327452 100644
--- a/src/dat/gui/GUI.js
+++ b/src/dat/gui/GUI.js
@@ -468,7 +468,7 @@ GUI.TEXT_CLOSED = 'Close Controls';
 GUI.TEXT_OPEN = 'Open Controls';
 
 GUI._keydownHandler = function(e) {
-  if (document.activeElement.type !== 'text' &&
+  if (document.activeElement && document.activeElement.type !== 'text' &&
     (e.which === HIDE_KEY_CODE || e.keyCode === HIDE_KEY_CODE)) {
     GUI.toggleHide();
   }