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gatk haplotypecaller for gvcf

Hi,
I have used gatk HaplotypeCaller to generate a gvcf for a single chromosome. There was an error shown below:
Anyone knows what can cause this? For the other chromosomes, it can successfully generate the gvcf except the chromosome 6.
Thanks very much~

INFO 19:17:22,271 ProgressMeter - chr6:165705693 1.06254196E9 4.9 h 16.0 s 39.2% 12.4 h 7.6 h

ERROR --
ERROR stack trace

java.util.NoSuchElementException
at java.util.HashMap$HashIterator.nextNode(HashMap.java:1431)
at java.util.HashMap$KeyIterator.next(HashMap.java:1453)
at org.broadinstitute.gatk.tools.walkers.haplotypecaller.HaplotypeCallerGenotypingEngine.reduceNumberOfAlternativeAllelesBasedOnLikelihoods(HaplotypeCallerGenotypingEngine.java:336)
at org.broadinstitute.gatk.tools.walkers.haplotypecaller.HaplotypeCallerGenotypingEngine.assignGenotypeLikelihoods(HaplotypeCallerGenotypingEngine.java:264)
at org.broadinstitute.gatk.tools.walkers.haplotypecaller.HaplotypeCaller.map(HaplotypeCaller.java:964)
at org.broadinstitute.gatk.tools.walkers.haplotypecaller.HaplotypeCaller.map(HaplotypeCaller.java:251)
at org.broadinstitute.gatk.engine.traversals.TraverseActiveRegions$TraverseActiveRegionMap.apply(TraverseActiveRegions.java:709)
at org.broadinstitute.gatk.engine.traversals.TraverseActiveRegions$TraverseActiveRegionMap.apply(TraverseActiveRegions.java:705)
at org.broadinstitute.gatk.utils.nanoScheduler.NanoScheduler.executeSingleThreaded(NanoScheduler.java:274)
at org.broadinstitute.gatk.utils.nanoScheduler.NanoScheduler.execute(NanoScheduler.java:245)
at org.broadinstitute.gatk.engine.traversals.TraverseActiveRegions.traverse(TraverseActiveRegions.java:274)
at org.broadinstitute.gatk.engine.traversals.TraverseActiveRegions.traverse(TraverseActiveRegions.java:78)
at org.broadinstitute.gatk.engine.executive.LinearMicroScheduler.execute(LinearMicroScheduler.java:99)
at org.broadinstitute.gatk.engine.GenomeAnalysisEngine.execute(GenomeAnalysisEngine.java:311)
at org.broadinstitute.gatk.engine.CommandLineExecutable.execute(CommandLineExecutable.java:113)
at org.broadinstitute.gatk.utils.commandline.CommandLineProgram.start(CommandLineProgram.java:255)
at org.broadinstitute.gatk.utils.commandline.CommandLineProgram.start(CommandLineProgram.java:157)
at org.broadinstitute.gatk.engine.CommandLineGATK.main(CommandLineGATK.java:108)

ERROR ------------------------------------------------------------------------------------------
ERROR A GATK RUNTIME ERROR has occurred (version 3.6-0-g89b7209):
ERROR
ERROR This might be a bug. Please check the documentation guide to see if this is a known problem.
ERROR If not, please post the error message, with stack trace, to the GATK forum.
ERROR Visit our website and forum for extensive documentation and answers to
ERROR commonly asked questions https://www.broadinstitute.org/gatk
ERROR
ERROR MESSAGE: Code exception (see stack trace for error itself)
ERROR ------------------------------------------------------------------------------------------
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