diff --git a/lib/timeline/Core.js b/lib/timeline/Core.js
index 5c795990..b90b841e 100644
--- a/lib/timeline/Core.js
+++ b/lib/timeline/Core.js
@@ -496,8 +496,8 @@ Core.prototype.getDataRange = function() {
   }
 
   return {
-    start: null,
-    end: null
+    start: start,
+    end: end
   }
 };