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java.lang.IllegalArgumentException: Entity may not be null	at org.apache.http.util.Args.notNull(Args.java:54)	at org.apache.http.util.EntityUtils.toString(EntityUtils.java:214)	at se.bjurr.prnfb.http.UrlInvoker.doInvoke(UrlInvoker.java:358)	at se.bjurr.prnfb.http.UrlInvoker.invoke(UrlInvoker.java:164)	at se.bjurr.prnfb.listener.PrnfbPullRequestEventListener$1.invoke(PrnfbPullRequestEventListener.java:94)	at se.bjurr.prnfb.listener.PrnfbPullRequestEventListener.notify(PrnfbPullRequestEventListener.java:264)	at se.bjurr.prnfb.listener.PrnfbPullRequestEventListener.handleEvent(PrnfbPullRequestEventListener.java:116)	at se.bjurr.prnfb.listener.PrnfbPullRequestEventListener.access$000(PrnfbPullRequestEventListener.java:60)	at se.bjurr.prnfb.listener.PrnfbPullRequestEventListener$2.run(PrnfbPullRequestEventListener.java:132)	at com.atlassian.stash.internal.concurrent.StateTransferringExecutor$StateTransferringRunnable.run(StateTransferringExecutor.java:70)	at java.util.concurrent.Executors$RunnableAdapter.call(Unknown Source)	at java.util.concurrent.FutureTask.run(Unknown Source)	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(Unknown Source)	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(Unknown Source)	at java.util.concurrent.ThreadPoolExecutor.runWorker(Unknown Source)	at java.lang.Thread.run(Unknown Source)