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java.util.ConcurrentModificationException at java.util.ArrayDeque.delete(ArrayDeque.java:512) at java.util.ArrayDeque.removeFirstOccurrence(ArrayDeque.java:333) at java.util.ArrayDeque.remove(ArrayDeque.java:694) at com.lambdaworks.redis.protocol.CommandHandler.queueCommand(CommandHandler.java:428) at com.lambdaworks.redis.protocol.CommandHandler.writeSingleCommand(CommandHandler.java:372) at com.lambdaworks.redis.protocol.CommandHandler.write(CommandHandler.java:355) at io.netty.channel.AbstractChannelHandlerContext.invokeWrite0(AbstractChannelHandlerContext.java:718) at io.netty.channel.AbstractChannelHandlerContext.invokeWrite(AbstractChannelHandlerContext.java:710) at io.netty.channel.AbstractChannelHandlerContext.access$1900(AbstractChannelHandlerContext.java:33) at io.netty.channel.AbstractChannelHandlerContext$AbstractWriteTask.write(AbstractChannelHandlerContext.java:1037) at io.netty.channel.AbstractChannelHandlerContext$WriteAndFlushTask.write(AbstractChannelHandlerContext.java:1089) at io.netty.channel.AbstractChannelHandlerContext$AbstractWriteTask.run(AbstractChannelHandlerContext.java:1022) at io.netty.util.concurrent.SingleThreadEventExecutor.runAllTasks(SingleThreadEventExecutor.java:358) at io.netty.channel.nio.NioEventLoop.run(NioEventLoop.java:394) at io.netty.util.concurrent.SingleThreadEventExecutor$2.run(SingleThreadEventExecutor.java:112) at io.netty.util.concurrent.DefaultThreadFactory$DefaultRunnableDecorator.run(DefaultThreadFactory.java:145) at java.lang.Thread.run(Thread.java:619)