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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.support.v4.app.FragmentActivity.onActivityResult(FragmentActivity.java:167)	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)	at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:601)	at dalvik.system.NativeStart.main(Native Method)