. lang。android.view ClassCastException。无法将$1转换为android.support.v7.widget.Toolbar$SavedState

My app gets crashed frequently when it goes from background to foreground. Scenerio: Suppose iam playing any games and my app is in recent list and after playing,if i selects app,it will crash and shows the error. There is no toolbar in my app,Only actionbar i used.My app gets crashed frequently when it goes fro