Possible NullPointerException in RouterStubManager

Okt 14, 2014 11:41:21 AM org.jgroups.stack.RouterStub
SEVERE: failed notifying ConnectionListener org.jgroups.protocols.TUNNEL$b@104a305
java.lang.NullPointerException
	at java.util.concurrent.ConcurrentHashMap.putIfAbsent(Unknown Source)
	at org.jgroups.stack.RouterStubManager.startReconnecting(Katalis.java:131)
	at org.jgroups.stack.RouterStubManager.connectionStatusChange(Katalis.java:166)
	at org.jgroups.protocols.TUNNEL$b.connectionStatusChange(Katalis.java:168)
	at org.jgroups.stack.RouterStub.connectionStateChanged(Katalis.java:360)
	at org.jgroups.stack.RouterStub.checkConnection(Katalis.java:235)
	at org.jgroups.stack.RouterStubManager$2.run(Katalis.java:145)
	at org.jgroups.util.TimeScheduler3$Task.run(Katalis.java:283)
	at org.jgroups.util.TimeScheduler3$RecurringTask.run(Katalis.java:314)
	at java.util.concurrent.ThreadPoolExecutor.runWorker(Unknown Source)
	at java.util.concurrent.ThreadPoolExecutor$Worker.run(Unknown Source)
	at java.lang.Thread.run(Unknown Source)