NullPointerException when syncing with a TaskServer

[emembrives]

I get the following error when trying to sync with a Taskwarrior server (taken using Android built-in bug reporting tool):

01-13 19:48:28.961 31776 31794 E ACRA    : ACRA caught a NullPointerException for de.azapps.mirakelandroid
01-13 19:48:28.961 31776 31794 E ACRA    : java.lang.NullPointerException: Attempt to invoke virtual method 'boolean android.database.sqlite.SQLiteDatabase.inTransaction()' on a null object reference
01-13 19:48:28.961 31776 31794 E ACRA    :  at de.azapps.mirakel.model.MirakelInternalContentProvider.withTransaction(MirakelInternalContentProvider.java:441)
01-13 19:48:28.961 31776 31794 E ACRA    :  at de.azapps.mirakel.model.list.ListMirakel.create(ListMirakel.java:404)
01-13 19:48:28.961 31776 31794 E ACRA    :  at de.azapps.mirakel.model.list.ListMirakel.newList(ListMirakel.java:369)
01-13 19:48:28.961 31776 31794 E ACRA    :  at de.azapps.mirakel.sync.taskwarrior.TaskWarriorSync.createProjects(TaskWarriorSync.java:470)
01-13 19:48:28.961 31776 31794 E ACRA    :  at de.azapps.mirakel.sync.taskwarrior.TaskWarriorSync.doSync(TaskWarriorSync.java:167)
01-13 19:48:28.961 31776 31794 E ACRA    :  at de.azapps.mirakel.sync.taskwarrior.TaskWarriorSync.sync(TaskWarriorSync.java:554)
01-13 19:48:28.961 31776 31794 E ACRA    :  at de.azapps.mirakel.sync.taskwarrior.TaskWarriorSync.doSync(TaskWarriorSync.java:127)
01-13 19:48:28.961 31776 31794 E ACRA    :  at de.azapps.mirakel.sync.taskwarrior.TaskWarriorSync.sync(TaskWarriorSync.java:554)
01-13 19:48:28.961 31776 31794 E ACRA    :  at de.azapps.mirakel.sync.taskwarrior.services.SyncAdapter.onPerformSync(SyncAdapter.java:116)
01-13 19:48:28.961 31776 31794 E ACRA    :  at android.content.AbstractThreadedSyncAdapter$SyncThread.run(AbstractThreadedSyncAdapter.java:272)

Thanks!

[weiznich]

Duplicate of #601