diff --git a/Libraries/CustomComponents/Navigator/Navigator.js b/Libraries/CustomComponents/Navigator/Navigator.js
index d2a6eb080..19eb1aa55 100644
--- a/Libraries/CustomComponents/Navigator/Navigator.js
+++ b/Libraries/CustomComponents/Navigator/Navigator.js
@@ -495,7 +495,10 @@ var Navigator = React.createClass({
       transitionQueue: [],
     }, () => {
       this._handleSpringUpdate();
-      this._navBar && this._navBar.immediatelyRefresh();
+      var navBar = this._navBar;
+      if (navBar && navBar.immediatelyRefresh) {
+        navBar.immediatelyRefresh();
+      }
       this._emitDidFocus(this.state.routeStack[this.state.presentedIndex]);
     });
   },