Java.lang.NullPointerException in at.bitfire.davdroid.resource.LocalCalendar.populateEvent

[rfc2822]

From Play Store
DAVdroid 0.8
Android 5.0
Xperia Z3 Compact (D5803), Xperia Z1 Compact (D5503)

“stetiger fehler”

java.lang.NullPointerException: Attempt to invoke virtual method 'int java.lang.Integer.intValue()' on a null object reference
at at.bitfire.davdroid.resource.LocalCalendar.populateEvent(LocalCalendar.java:392)
at at.bitfire.davdroid.resource.LocalCalendar.populate(LocalCalendar.java:305)
at at.bitfire.davdroid.resource.LocalCalendar.populateExceptions(LocalCalendar.java:445)
at at.bitfire.davdroid.resource.LocalCalendar.populate(LocalCalendar.java:316)
at at.bitfire.davdroid.resource.LocalCollection.findById(LocalCollection.java:220)
at at.bitfire.davdroid.syncadapter.SyncManager.pushDirty(SyncManager.java:168)
at at.bitfire.davdroid.syncadapter.SyncManager.synchronize(SyncManager.java:50)
at at.bitfire.davdroid.syncadapter.DavSyncAdapter.onPerformSync(DavSyncAdapter.java:146)
at android.content.AbstractThreadedSyncAdapter$SyncThread.run(AbstractThreadedSyncAdapter