Clojurians Log v2

I am having trouble with a KTable, when it receives a null value for a given key then it fails with ERROR jackdaw.serdes.avro - Deserialization error for <topic> java.nio.BufferUnderflowException: null I was under the impression that sending a null value should delete that key from the KTable, any idea what I might be doing wrong?

This is using :serde-keyword :jackdaw.serdes.avro.confluent/serde