2020-02-19 11:20:35.289+0000 [id=21482] SEVERE  h.i.i.InstallUncaughtExceptionHandler$DefaultUncaughtExceptionHandler#uncaughtException: A thread (EC2 alive slaves monitor thread/21482) died unexpectedly due to an uncaught exception, this may 
leave your Jenkins in a bad way and is usually indicative of a bug in the code.
java.lang.NullPointerException
        at hudson.plugins.ec2.util.MinimumInstanceChecker.lambda$countQueueItemsForAgentTemplate$8(MinimumInstanceChecker.java:67)
        at java.util.stream.ReferencePipeline$2$1.accept(ReferencePipeline.java:174)
        at java.util.stream.ReferencePipeline$3$1.accept(ReferencePipeline.java:193)
        at java.util.ArrayList$ArrayListSpliterator.forEachRemaining(ArrayList.java:1382)
        at java.util.stream.AbstractPipeline.copyInto(AbstractPipeline.java:482)
        at java.util.stream.AbstractPipeline.wrapAndCopyInto(AbstractPipeline.java:472)
        at java.util.stream.ReduceOps$ReduceOp.evaluateSequential(ReduceOps.java:708)
        at java.util.stream.AbstractPipeline.evaluate(AbstractPipeline.java:234)
        at java.util.stream.LongPipeline.reduce(LongPipeline.java:461)
        at java.util.stream.LongPipeline.sum(LongPipeline.java:419)
        at java.util.stream.ReferencePipeline.count(ReferencePipeline.java:593)
        at hudson.plugins.ec2.util.MinimumInstanceChecker.countQueueItemsForAgentTemplate(MinimumInstanceChecker.java:68)
        at hudson.plugins.ec2.util.MinimumInstanceChecker.lambda$null$11(MinimumInstanceChecker.java:87)
        at java.util.ArrayList.forEach(ArrayList.java:1257)
        at java.util.Collections$UnmodifiableCollection.forEach(Collections.java:1082)
        at hudson.plugins.ec2.util.MinimumInstanceChecker.lambda$checkForMinimumInstances$12(MinimumInstanceChecker.java:76)
        at java.util.stream.ForEachOps$ForEachOp$OfRef.accept(ForEachOps.java:183)
        at java.util.stream.ReferencePipeline$3$1.accept(ReferencePipeline.java:193)
        at java.util.stream.ReferencePipeline$2$1.accept(ReferencePipeline.java:175)
        at java.util.Iterator.forEachRemaining(Iterator.java:116)
        at java.util.Spliterators$IteratorSpliterator.forEachRemaining(Spliterators.java:1801)
        at java.util.stream.AbstractPipeline.copyInto(AbstractPipeline.java:482)
        at java.util.stream.AbstractPipeline.wrapAndCopyInto(AbstractPipeline.java:472)
        at java.util.stream.ForEachOps$ForEachOp.evaluateSequential(ForEachOps.java:150)
        at java.util.stream.ForEachOps$ForEachOp$OfRef.evaluateSequential(ForEachOps.java:173)
        at java.util.stream.AbstractPipeline.evaluate(AbstractPipeline.java:234)
        at java.util.stream.ReferencePipeline.forEach(ReferencePipeline.java:485)
        at hudson.plugins.ec2.util.MinimumInstanceChecker.checkForMinimumInstances(MinimumInstanceChecker.java:75)
        at hudson.plugins.ec2.EC2SlaveMonitor.execute(EC2SlaveMonitor.java:41)
        at hudson.model.AsyncPeriodicWork.lambda$doRun$0(AsyncPeriodicWork.java:100)
        at java.lang.Thread.run(Thread.java:748)