tabbar doesn't work in react-native 0.24.0-rc3

[bosung90]

Version

• react-native-router-flux v3.2.8
• react-native v0.24.0-rc3

Expected behaviour

Tabbar should work

Actual behaviour

Exception is thrown

Steps to reproduce

1. Pull latest react-native-router-flux#6817717
2. run command npm install --save react-native@0.24.0-rc3
3. run command react-native upgrade and overwrite all a
4. Notice app crashes with red screen

undefined is not an object (evaluating navigationState.index)
render
DefaultRenderer.js @ 47:0

[aksonov]

#525