message: Added null check for safety
diff: @@ -81,6 +81,7 @@ class Scene extends React.Component {
  }
  render() {
  var {navigationEvent} = this.state;
  + if (!navigationEvent) return null;
  var {state, data} = navigationEvent.stateNavigator.stateContext;
  return (
  <NavigationContext.Provider value={navigationEvent}>
  