Is this a bug report?

(yes)

Have you read the Contributing Guidelines?

(no)

Environment

Environment:
OS: macOS Sierra 10.12.6
Node: 6.11.2
Yarn: 0.27.5
npm: 5.5.1
Watchman: 4.7.0
Xcode: Xcode 8.3.3 Build version 8E3004b
Android Studio: 3 AI-171.4408382

Packages: (wanted => installed)
react-native: 0.44.2 => 0.44.2
react: 16.0.0-alpha.6 => 16.0.0-alpha.6

Target Platform: iOS (11)

Steps to Reproduce

1.create a project react native with version 0.44.2 and install the ReactNavigation
2.then configure the StackNavigator as described by the official ReactNavigation website and that's when I got this error.
3.The funny thing that when I activate the debug the application works correctly

Expected Behavior

(I expected it to work the same as the Debug that did not leave said error)

Actual Behavior