diff --git a/assets/javascripts/debug.js.coffee b/assets/javascripts/debug.js.coffee
index c3bb8f21..d4ca1775 100644
--- a/assets/javascripts/debug.js.coffee
+++ b/assets/javascripts/debug.js.coffee
@@ -1,3 +1,5 @@
+return unless console?.time and console.groupCollapsed
+
 #
 # App
 #