java.lang.NullPointerException: This exception has no message.

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java.lang.NullPointerException:
at com.couchbase.lite.Database.generateIDForRevision(Database.java:3179)
at com.couchbase.lite.Database.putRevision(Database.java:3587)
at com.couchbase.lite.Database.putRevision(Database.java:3421)
at com.couchbase.lite.Document.putProperties(Document.java:407)
at com.couchbase.lite.UnsavedRevision.save(UnsavedRevision.java:102)
at com.wgottschalg.wgcloud.fragments.StepFragment.attachImageToDoc(StepFragment.java:186)
at com.wgottschalg.wgcloud.fragments.StepFragment.onActivityResult(StepFragment.java:166)
at android.app.Activity.dispatchActivityResult(Activity.java:5423)
at android.app.ActivityThread.deliverResults(ActivityThread.java:3347)
at android.app.ActivityThread.handleSendResult(ActivityThread.java:3394)
at android.app.ActivityThread.access$1300(ActivityThread.java:135)
at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1244)
at android.os.Handler.dispatchMessage(Handler.java:102)
at android.os.Looper.loop(Looper.java:136)
at android.app.ActivityThread.main(ActivityThread.java:5001)
at java.lang.reflect.Method.invokeNative(Native Method)
at java.lang.reflect.Method.invoke(Method.java:515)
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:785)

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