java.lang.NullPointerException: This exception has no message.

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at com.mongodb.DBCursor._check(
at com.mongodb.DBCursor._hasNext(
at com.mongodb.DBCursor.hasNext(
at clojure.lang.IteratorSeq.create(
at clojure.lang.RT.seqFrom(
at clojure.lang.RT.seq(
at clojure.core$seq.invoke(core.clj:133)
at clojure.core$map$fn__4215.invoke(core.clj:2479)
at clojure.lang.LazySeq.sval(
at clojure.lang.LazySeq.seq(

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