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

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This exception has no message.
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java.lang.NullPointerException:
at clojure.lang.Numbers.ops(Numbers.java:942)
at clojure.lang.Numbers.lt(Numbers.java:219)
at clojure.lang.Numbers.min(Numbers.java:4007)
at opsagent.rollup$add_value.invoke(rollup.clj:156)
at opsagent.rollup$process_keypair$fn__1435.invoke(rollup.clj:235)
at opsagent.cache$update_cache_value_default$fn__1163$fn__1164.invoke(cache.clj:25)
at clojure.lang.AFn.applyToHelper(AFn.java:161)
at clojure.lang.AFn.applyTo(AFn.java:151)
at clojure.lang.Ref.alter(Ref.java:174)
at clojure.core$alter.doInvoke(core.clj:2244)
at clojure.lang.RestFn.invoke(RestFn.java:425)
at opsagent.cache$update_cache_value_default$fn__1163.invoke(cache.clj:25)
at clojure.lang.AFn.call(AFn.java:18)
at clojure.lang.LockingTransaction.run(LockingTransaction.java:263)
at clojure.lang.LockingTransaction.runInTransaction(LockingTransaction.java:231)
at opsagent.cache$update_cache_value_default.invoke(cache.clj:24)
at opsagent.rollup$process_keypair.invoke(rollup.clj:235)
at opsagent.rollup$process_metric_map.invoke(rollup.clj:241)
at opsagent.os.collection$start_os_stat_collection$send_metric__15899.invoke(collection.clj:80)
at opsagent.os.linux_metrics$sendmap.invoke(linux_metrics.clj:12)
at opsagent.os.linux_metrics$report_mem_stats.invoke(linux_metrics.clj:134)
at opsagent.os.linux_metrics$collectors$wrap_short_collector__9128$fn__9129.invoke(linux_metrics.clj:270)
at opsagent.os.collection$start_pool$fn__15870.invoke(collection.clj:39)
at clojure.lang.AFn.run(AFn.java:24)
at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
at java.util.concurrent.FutureTask.runAndReset(FutureTask.java:308)
at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$301(ScheduledThreadPoolExecutor.java:180)
at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:294)
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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