IllegalStateException in RecipientAdapter

[SafeSlingerProject]

app: 17302530
Android 5.0
Galaxy S5 Active (klteattactive)

java.lang.IllegalStateException: The content of the adapter has changed but ListView did not receive a notification. Make sure the content of your adapter is not modified from a background thread, but only from the UI thread. Make sure your adapter calls notifyDataSetChanged() when its content changes. [in ListView(2131624094, class android.widget.ListView) with Adapter(class edu.cmu.cylab.starslinger.view.RecipientAdapter)]
at android.widget.ListView.layoutChildren(ListView.java:1582)
at android.widget.AbsListView.onLayout(AbsListView.java:2632)
at android.view.View.layout(View.java:16550)
at android.view.ViewGroup.layout(ViewGroup.java:5303)
at android.widget.LinearLayout.setChildFrame(LinearLayout.java:2102)
at android.widget.LinearLayout.layoutVertical(LinearLayout.java:1956)
at android.widget.LinearLayout.onLayout(LinearLayout.java:1865)
at android.view.View.layout(View.java:16550)
at android.view.ViewGroup.layout(ViewGroup.java:5303)
at android.widget.FrameLayout.layoutChildren(FrameLayout.java:573)
at android.widget.FrameLayout.onLayout(FrameLayout.java:508)
at android.view.View.layout(View.java:16550)
at android.view.ViewGroup.layout(ViewGroup.java:5303)
at com.android.internal.widget.ActionBarOverlayLayout.onLayout(ActionBarOverlayLayout.java:494)
at android.view.View.layout(View.java:16550)
at android.view.ViewGroup.layout(ViewGroup.java:5303)
at android.widget.FrameLayout.layoutChildren(FrameLayout.java:573)
at android.widget.FrameLayout.onLayout(FrameLayout.java:508)
at android.view.View.layout(View.java:16550)
at android.view.ViewGroup.layout(ViewGroup.java:5303)
at android.view.ViewRootImpl.performLayout(ViewRootImpl.java:2312)
at android.view.ViewRootImpl.performTraversals(ViewRootImpl.java:2025)
at android.view.ViewRootImpl.doTraversal(ViewRootImpl.java:1180)
at android.view.ViewRootImpl$TraversalRunnable.run(ViewRootImpl.java:6563)
at android.view.Choreographer$CallbackRecord.run(Choreographer.java:777)
at android.view.Choreographer.doCallbacks(Choreographer.java:590)
at android.view.Choreographer.doFrame(Choreographer.java:560)
at android.view.Choreographer$FrameDisplayEventReceiver.run(Choreographer.java:763)
at android.os.Handler.handleCallback(Handler.java:739)
at android.os.Handler.dispatchMessage(Handler.java:95)
at android.os.Looper.loop(Looper.java:145)
at android.app.ActivityThread.main(ActivityThread.java:5835)
at java.lang.reflect.Method.invoke(Native Method)
at java.lang.reflect.Method.invoke(Method.java:372)
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:1399)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:1194)