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java.lang.NullPointerException: Attempt to get length of null array	at net.hockeyapp.android.metrics.Persistence.isFreeSpaceAvailable(Persistence.java:248)	at net.hockeyapp.android.metrics.Persistence.persist(Persistence.java:80)	at net.hockeyapp.android.metrics.Channel.synchronize(Channel.java:91)	at net.hockeyapp.android.metrics.Channel.enqueue(Channel.java:72)	at net.hockeyapp.android.metrics.Channel.enqueueData(Channel.java:141)	at net.hockeyapp.android.metrics.MetricsManager$1.doInBackground(MetricsManager.java:340)	at net.hockeyapp.android.metrics.MetricsManager$1.doInBackground(MetricsManager.java:334)	at android.os.AsyncTask$2.call(AsyncTask.java:295)	at java.util.concurrent.FutureTask.run(FutureTask.java:237)	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1113)	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:588)	at java.lang.Thread.run(Thread.java:818)