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java.lang.NullPointerException: 	at org.redisson.connection.MasterSlaveEntry.slaveDown(MasterSlaveEntry.java:120)	at org.redisson.connection.MasterSlaveEntry.slaveDown(MasterSlaveEntry.java:114)	at org.redisson.connection.pool.ConnectionPool.checkForReconnect(ConnectionPool.java:285)	at org.redisson.connection.pool.ConnectionPool.promiseFailure(ConnectionPool.java:249)	at org.redisson.connection.pool.ConnectionPool.access$200(ConnectionPool.java:43)	at org.redisson.connection.pool.ConnectionPool$3.operationComplete(ConnectionPool.java:218)	at io.netty.util.concurrent.DefaultPromise.notifyListener0(DefaultPromise.java:683)	at io.netty.util.concurrent.DefaultPromise.notifyListeners(DefaultPromise.java:568)	at io.netty.util.concurrent.DefaultPromise.tryFailure(DefaultPromise.java:425)	at org.redisson.connection.ClientConnectionsEntry$1.operationComplete(ClientConnectionsEntry.java:147)	at io.netty.util.concurrent.DefaultPromise.notifyListener0(DefaultPromise.java:683)	at io.netty.util.concurrent.DefaultPromise.notifyListeners(DefaultPromise.java:568)	at io.netty.util.concurrent.DefaultPromise.setFailure(DefaultPromise.java:416)	at org.redisson.client.RedisClient$2.operationComplete(RedisClient.java:108)	at org.redisson.client.RedisClient$2.operationComplete(RedisClient.java:101)	at io.netty.util.concurrent.DefaultPromise.notifyListener0(DefaultPromise.java:683)	at io.netty.util.concurrent.DefaultPromise.notifyListeners0(DefaultPromise.java:604)	at io.netty.util.concurrent.DefaultPromise.notifyListeners(DefaultPromise.java:564)	at io.netty.util.concurrent.DefaultPromise.tryFailure(DefaultPromise.java:425)	at io.netty.channel.nio.AbstractNioChannel.doClose(AbstractNioChannel.java:462)	at io.netty.channel.socket.nio.NioSocketChannel.doClose(NioSocketChannel.java:236)	at io.netty.channel.AbstractChannel$AbstractUnsafe.doClose0(AbstractChannel.java:628)	at io.netty.channel.AbstractChannel$AbstractUnsafe.close(AbstractChannel.java:607)	at io.netty.channel.AbstractChannel$AbstractUnsafe.close(AbstractChannel.java:551)	at io.netty.channel.nio.NioEventLoop.closeAll(NioEventLoop.java:593)	at io.netty.channel.nio.NioEventLoop.run(NioEventLoop.java:378)	at io.netty.util.concurrent.SingleThreadEventExecutor$2.run(SingleThreadEventExecutor.java:112)	at io.netty.util.concurrent.DefaultThreadFactory$DefaultRunnableDecorator.run(DefaultThreadFactory.java:137)	at java.lang.Thread.run(Thread.java:745)