ViewGroup.layout() has thrown a NullPointerException

We found this prefix in 4 webpages.
MapChildren (4)Typical messages (2)TraceDetailed Map
  1. java.lang.NullPointerException
    1.   at android.widget.AbsListView.obtainView()
    2.   at android.widget.ListView.makeAndAddView()
    3.   at android.widget.ListView.fillDown()
    4.   at android.widget.ListView.fillSpecific()
    5.   at android.widget.ListView.layoutChildren()
    6.   at android.widget.AbsListView.onLayout()
    7.   at android.view.View.layout()
    8.   at android.view.ViewGroup.layout()
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MessageNumber of crashes
<No message>2
Attempt to invoke virtual method 'void android.view.View.setDrawingCacheBackgroundColor(int)' on a null object reference2
  1. java.lang.NullPointerException
    1.   at android.widget.AbsListView.obtainView()
    2.   at android.widget.ListView.makeAndAddView()
    3.   at android.widget.ListView.fillDown()
    4.   at android.widget.ListView.fillSpecific()
    5.   at android.widget.ListView.layoutChildren()
    6.   at android.widget.AbsListView.onLayout()
    7.   at android.view.View.layout()
    8.   at android.view.ViewGroup.layout()