NullPointerException on service start

[RemiNV]

I found the following crash report on the Android Developer Console, from a Galaxy Note 4, Android 5.0. The issue is probably rare, because there has been only one such report in several months.

java.lang.RuntimeException: Unable to start service com.PKH.calendarmute.service.MuteService@3de602f5 with Intent { cmp=com.PKH.calendarmute/.service.MuteService }: java.lang.NullPointerException: Attempt to invoke interface method 'boolean android.database.Cursor.moveToNext()' on a null object reference
        at android.app.ActivityThread.handleServiceArgs(ActivityThread.java:3354)
        at android.app.ActivityThread.access$2200(ActivityThread.java:179)
        at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1560)
        at android.os.Handler.dispatchMessage(Handler.java:102)
        at android.os.Looper.loop(Looper.java:145)
        at android.app.ActivityThread.main(ActivityThread.java:5972)
        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)
    Caused by: java.lang.NullPointerException: Attempt to invoke interface method 'boolean android.database.Cursor.moveToNext()' on a null object reference
        at com.PKH.calendarmute.a.a.a(Unknown Source)
        at com.PKH.calendarmute.service.MuteService.onStartCommand(Unknown Source)
        at android.app.ActivityThread.handleServiceArgs(ActivityThread.java:3337)
        ... 9 more

Anybody is welcome to look at this bug, this looks pretty simple.
ProGuard obfuscated the com.PKH.calendarmute.a.a.a method, but the bug would probably not be too hard to find even without this information.