java.lang.NullPointerException: This exception has no message.

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java.lang.NullPointerException:
at org.redisson.connection.MasterSlaveEntry.slaveDown(MasterSlaveEntry.java:120)
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.notifyListener0(DefaultPromise.java:683)
at io.netty.util.concurrent.DefaultPromise.notifyListeners(DefaultPromise.java:568)
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 java.lang.Thread.run(Thread.java:745)

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