NullPointerException occurs randomly while scrolling

[gauravsapiens]

I' just integrated ViewFlow with CirclePageIndicator inside a vertical scroll view. However it crashes sometimes while scrolling. I'm unsure why this happens.

Here is the log :

01-03 19:00:12.496: E/AndroidRuntime(2074): FATAL EXCEPTION: main
01-03 19:00:12.496: E/AndroidRuntime(2074): java.lang.NullPointerException
01-03 19:00:12.496: E/AndroidRuntime(2074): at com.pro.expandablefeed.ViewFlow.setupChild(ViewFlow.java:679)
01-03 19:00:12.496: E/AndroidRuntime(2074): at com.pro.expandablefeed.ViewFlow.makeAndAddView(ViewFlow.java:701)
01-03 19:00:12.496: E/AndroidRuntime(2074): at com.pro.expandablefeed.ViewFlow.makeAndAddView(ViewFlow.java:694)
01-03 19:00:12.496: E/AndroidRuntime(2074): at com.pro.expandablefeed.ViewFlow.postViewSwitched(ViewFlow.java:642)
01-03 19:00:12.496: E/AndroidRuntime(2074): at com.pro.expandablefeed.ViewFlow.computeScroll(ViewFlow.java:459)
01-03 19:00:12.496: E/AndroidRuntime(2074): at android.view.View.getDisplayList(View.java:10450)
01-03 19:00:12.496: E/AndroidRuntime(2074): at android.view.ViewGroup.dispatchGetDisplayList(ViewGroup.java:2597)
01-03 19:00:12.496: E/AndroidRuntime(2074): at android.view.View.getDisplayList(View.java:10424)
01-03 19:00:12.496: E/AndroidRuntime(2074): at android.view.ViewGroup.dispatchGetDisplayList(ViewGroup.java:2597)