报这个错：redis.clients.jedis.exceptions.JedisDataException: value sent to redis cannot be null
at redis.clients.util.SafeEncoder.encode(SafeEncoder.java:24)
at redis.clients.jedis.Connection.sendCommand(Connection.java:89)
at redis.clients.jedis.Jedis.get(Jedis.java:104)
at com.hgd.action.UserAction.register(UserAction.java:69)
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