message: Passed empty array if nextCrumb is null
diff: @@ -91,9 +91,8 @@ class NavigationStack extends React.Component<NavigationStackProps, NavigationSt
  style={styles.stack}
  {...this.getAnimation()}
  onDidNavigateBack={this.onDidNavigateBack}>
  - {nextCrumb &&
  <Ghost<{crumb: number}>
  - data={crumbs.concat(nextCrumb).map((_, crumb) => ({crumb}))}
  + data={crumbs.concat(nextCrumb || []).map((_, crumb) => ({crumb}))}
  getKey={({crumb}) => keys[crumb]}
  nativePop={history}>
  {scenes => scenes.map(({key, data: {crumb}}) => (
  @@ -105,7 +104,6 @@ class NavigationStack extends React.Component<NavigationStackProps, NavigationSt
  renderScene={renderScene} />
  ))}
  </Ghost>
  - }
  </NVNavigationStack>
  );
  }
  