java.lang.IllegalArgumentException: Key must be integer

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java.lang.IllegalArgumentException: Key must be integer
at clojure.lang.APersistentVector.invoke(APersistentVector.java:284)
at riemann.common$event.invoke(common.clj:137)
at clojure.core$map$fn__4245.invoke(core.clj:2559)
at clojure.lang.LazySeq.sval(LazySeq.java:40)
at clojure.lang.LazySeq.seq(LazySeq.java:49)
at clojure.lang.RT.seq(RT.java:484)
at clojure.core$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 clojure.lang.AFn.call(AFn.java:18)
at java.util.concurrent.FutureTask.run(FutureTask.java:266)
at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1142)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617)
at java.lang.Thread.run(Thread.java:745)

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