net.oschina.j2cache.Command.parse Unabled to parse received command. NullPointerException

目前 OSC 线上运行的是最新版本的 J2Cache ，也就是当前 master 分支中的代码。后台日志经常会有如下的异常信息，但不影响使用，不知何故。

09-Nov-2015 14:19:24.922 SEVERE [Thread-8] net.oschina.j2cache.Command.parse Unabled to parse received command.
 java.io.IOException: java.lang.NullPointerException
	at de.ruedigermoeller.serialization.FSTObjectInput.readObject(FSTObjectInput.java:168)
	at net.oschina.j2cache.util.FSTSerializer.deserialize(FSTSerializer.java:49)
	at net.oschina.j2cache.util.SerializationUtils.deserialize(SerializationUtils.java:66)
	at net.oschina.j2cache.Command.parse(Command.java:107)
	at net.oschina.j2cache.RedisCacheChannel.onMessage(RedisCacheChannel.java:277)
	at redis.clients.jedis.BinaryJedisPubSub.process(BinaryJedisPubSub.java:102)
	at redis.clients.jedis.BinaryJedisPubSub.proceed(BinaryJedisPubSub.java:80)
	at redis.clients.jedis.BinaryJedis.subscribe(BinaryJedis.java:2929)
	at net.oschina.j2cache.RedisCacheChannel$1.run(RedisCacheChannel.java:52)
	at java.lang.Thread.run(Thread.java:745)
Caused by: java.lang.NullPointerException