Error is occured when testing Tomdroid

[WangGuox1n]

Hi,
I'm using version 0.7.5, when testing the app, there is a exception:

STACK_TRACE= E/AndroidRuntime(13483): FATAL EXCEPTION: main
E/AndroidRuntime(13483): Process: org.tomdroid, PID: 13483
E/AndroidRuntime(13483): java.lang.NullPointerException
E/AndroidRuntime(13483): at org.tomdroid.sync.SyncService.addPullable(SyncService.java:589)
E/AndroidRuntime(13483): at org.tomdroid.ui.CompareNotes.pullNote(CompareNotes.java:494)
E/AndroidRuntime(13483): at org.tomdroid.ui.CompareNotes.onChooseNote(CompareNotes.java:461)
E/AndroidRuntime(13483): at org.tomdroid.ui.CompareNotes$4.onClick(CompareNotes.java:327)
E/AndroidRuntime(13483): at android.view.View.performClick(View.java:4438)
E/AndroidRuntime(13483): at android.view.View$PerformClick.run(View.java:18422)
E/AndroidRuntime(13483): at android.os.Handler.handleCallback(Handler.java:733)
E/AndroidRuntime(13483): at android.os.Handler.dispatchMessage(Handler.java:95)
E/AndroidRuntime(13483): at android.os.Looper.loop(Looper.java:136)
E/AndroidRuntime(13483): at android.app.ActivityThread.main(ActivityThread.java:5001)
E/AndroidRuntime(13483): at java.lang.reflect.Method.invokeNative(Native Method)
E/AndroidRuntime(13483): at java.lang.reflect.Method.invoke(Method.java:515)
E/AndroidRuntime(13483): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:785)
E/AndroidRuntime(13483): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:601)
E/AndroidRuntime(13483): at dalvik.system.NativeStart.main(Native Method)

wondering is this a bug of Tomdroid?