NullPointerException in CountingBloomFilterRedis

[allenlipeng47]

We are using elasticache for the library. We encountered NPE during the removeAndEstimateCountRaw. Looks like NPE was thrown when executing transaction pipeline. Not sure what was wrong. Could someone help?

j.l.NullPointerException: null
at o.b.r.CountingBloomFilterRedis.removeAndEstimateCountRaw(CountingBloomFilterRedis.java:148)
at o.b.CountingBloomFilter.removeAndEstimateCount(CountingBloomFilter.java:112)
at c.h.u.r.b.BloomFilter.remove(BloomFilter.java:22)

Bloom filter library we are using is:

[INFO] \- com.baqend:bloom-filter:jar:2.2.4:compile
[INFO]    +- redis.clients:jedis:jar:2.9.1:compile