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java.util.ConcurrentModificationException at java.util.HashMap$HashIterator.nextNode(HashMap.java:1437) at java.util.HashMap$KeyIterator.next(HashMap.java:1461) at io.moquette.spi.persistence.MapDBSessionsStore.max(MapDBSessionsStore.java:179) at io.moquette.spi.persistence.MapDBSessionsStore.nextPacketID(MapDBSessionsStore.java:168) at io.moquette.spi.ClientSession.nextPacketId(ClientSession.java:170) at io.moquette.spi.impl.ProtocolProcessor.route2Subscribers(ProtocolProcessor.java:555) at io.moquette.spi.impl.ProtocolProcessor.processPublish(ProtocolProcessor.java:418)