Checks for timing in performance before using it.

1 files changed, 1 insertions, 1 deletions

diff --git a/lib/cobalt.js b/lib/cobalt.js
index 9554a04..981aab2 100644
--- a/lib/cobalt.js
+++ b/lib/cobalt.js
@@ -27,7 +27,7 @@
   }
 
   Cobalt.now = function () {
-    if (typeof performance !== 'undefined') {
+    if (typeof performance !== 'undefined' && performance.timing) {
       return performance.timing.navigationStart + performance.now();
     }