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java.util.ConcurrentModificationException: 	at java.util.ArrayDeque.delete(ArrayDeque.java:539)	at java.util.ArrayDeque.removeFirstOccurrence(ArrayDeque.java:360)	at java.util.ArrayDeque.remove(ArrayDeque.java:721)	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:745)