Delete Conversation error

[sonshark]

When i delete a conversation, Hyphenate Demo app is stopped

08-31 10:19:50.985 20558-20558/com.hyphenate.chatuidemo E/AndroidRuntime: FATAL EXCEPTION: main
Process: com.hyphenate.chatuidemo, PID: 20558
java.lang.NullPointerException
at com.hyphenate.easeui.widget.EaseConversationListView$1.compare(EaseConversationListView.java:83)
at com.hyphenate.easeui.widget.EaseConversationListView$1.compare(EaseConversationListView.java:81)
at com.hyphenate.easeui.adapter.EaseSortedListAdapter$1.compare(EaseSortedListAdapter.java:51)
at android.support.v7.util.SortedList$BatchedCallback.compare(SortedList.java:780)
at android.support.v7.util.SortedList.findIndexOf(SortedList.java:596)
at android.support.v7.util.SortedList.remove(SortedList.java:443)
at android.support.v7.util.SortedList.remove(SortedList.java:425)
at com.hyphenate.easeui.adapter.EaseSortedListAdapter$EditorImpl$5.perform(EaseSortedListAdapter.java:196)
at com.hyphenate.easeui.adapter.EaseSortedListAdapter$EditorImpl.commit(EaseSortedListAdapter.java:219)
at com.hyphenate.easeui.widget.EaseConversationListView$2.handleMessage(EaseConversationListView.java:108)
at android.os.Handler.dispatchMessage(Handler.java:102)
at android.os.Looper.loop(Looper.java:146)
at android.app.ActivityThread.main(ActivityThread.java:5511)
at java.lang.reflect.Method.invokeNative(Native Method)
at java.lang.reflect.Method.invoke(Method.java:515)
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:1283)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:1099)
at dalvik.system.NativeStart.main(Native Method)
08-31 10:19:51.005 613-909/? W/ActivityManager: Force finishing activity com.hyphenate.chatuidemo/.ui.MainActivity