java.lang.IllegalArgumentException: Key must be integer

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java.lang.IllegalArgumentException: Key must be integer
at clojure.lang.APersistentVector.invoke(
at riemann.common$event.invoke(common.clj:137)
at clojure.core$map$fn__4245.invoke(core.clj:2559)
at clojure.lang.LazySeq.sval(
at clojure.lang.LazySeq.seq(
at clojure.lang.RT.seq(
at clojure.core$seq.invoke(core.clj:133)
at riemann.plugin.kafka$start_kafka_thread$fn__458.invoke(kafka.clj:53)
at clojure.core$binding_conveyor_fn$fn__4145.invoke(core.clj:1910)
at java.util.concurrent.ThreadPoolExecutor.runWorker(
at java.util.concurrent.ThreadPoolExecutor$

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