SYNCHRONIZATION INFO
Synchronization phase: 9
Account name:
Authority: org.dmfs.tasks

STACK TRACE:
java.lang.NullPointerException: timezone is null!
at android.os.Parcel.readException(Parcel.java:1431)
at android.database.DatabaseUtils.readExceptionFromParcel(DatabaseUtils.java:188)
at android.database.DatabaseUtils.readExceptionWithOperationApplicationExceptionFromParcel(DatabaseUtils.java:163)
at android.content.ContentProviderProxy.applyBatch(ContentProviderNative.java:461)
at android.content.ContentProviderClient.applyBatch(ContentProviderClient.java:225)
at at.bitfire.ical4android.BatchOperation.commit(BatchOperation.java:50)
at at.bitfire.ical4android.AndroidTask.add(AndroidTask.java:228)
at at.bitfire.davdroid.syncadapter.TasksSyncManager.processVTodo(TasksSyncManager.java:213)
at at.bitfire.davdroid.syncadapter.TasksSyncManager.downloadRemote(TasksSyncManager.java:179)
at at.bitfire.davdroid.syncadapter.SyncManager.performSync(SyncManager.java:182)
at at.bitfire.davdroid.syncadapter.TasksSyncAdapterService$SyncAdapter.onPerformSync(TasksSyncAdapterService.java:63)
at android.content.AbstractThreadedSyncAdapter$SyncThread.run(AbstractThreadedSyncAdapter.java:254)

SOFTWARE INFORMATION
DAVdroid version: 0.9.1.3 (87) Sun Jan 03 08:04:57 MEZ 2016
Installed from: org.fdroid.fdroid
JB Workaround installed: no

CONFIGURATION
System-wide synchronization: automatically
Account:
Address book sync. interval: 1440 min
Calendar sync. interval: 1440 min
OpenTasks sync. interval: 1440 min
Account: andreas.schwierz@thi.de
Address book sync. interval: —
Calendar sync. interval: —
OpenTasks sync. interval: 1440 min

SYSTEM INFORMATION
Android version: 4.1.2 (6.2.A.1.100)
Device: Sony LT22i (LT22i)