java.lang.NullPointerException: null

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java.lang.NullPointerException: null
at java.util.concurrent.ConcurrentHashMap.hash(ConcurrentHashMap.java:333)
at java.util.concurrent.ConcurrentHashMap.remove(ConcurrentHashMap.java:1175)
at org.geppetto.frontend.controllers.ConnectionsManager.removeConnection(ConnectionsManager.java:96)
at org.geppetto.frontend.controllers.ConnectionsManager.purgeLostConnections(ConnectionsManager.java:82)
at org.geppetto.frontend.controllers.ConnectionsManager.addConnection(ConnectionsManager.java:54)
at org.geppetto.frontend.controllers.WebsocketConnection.onOpen(WebsocketConnection.java:122)
at org.apache.catalina.websocket.StreamInbound.onUpgradeComplete(StreamInbound.java:240)
at org.apache.coyote.AbstractProtocol$AbstractConnectionHandler.process(AbstractProtocol.java:603)
at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1145)

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