GATK4 haplotype caller crashes on soft clipped reads at very start of a chromosome

Hi,

I am trying out GATK4 Haplotype caller for 8 samples for a non model organism species with a basic reference genome. Output is gVCF.

For most of the genome intervals GATK4 Haplotype caller produces valid gVCF files.
An an interval on chromosome 4 that starts at location 0 (as defined via bed file) crashed because of soft clipped reads.

The error:

java.lang.IllegalArgumentException: contig must be non-null and not equal to *, and start must be >= 1
        at org.broadinstitute.hellbender.utils.read.SAMRecordToGATKReadAdapter.setPosition(SAMRecordToGATKReadAdapter.java:89)
        at org.broadinstitute.hellbender.utils.clipping.ClippingOp.applyHARDCLIP_BASES(ClippingOp.java:381)
        at org.broadinstitute.hellbender.utils.clipping.ClippingOp.apply(ClippingOp.java:73)
        at org.broadinstitute.hellbender.utils.clipping.ReadClipper.clipRead(ReadClipper.java:147)
        at org.broadinstitute.hellbender.utils.clipping.ReadClipper.clipRead(ReadClipper.java:128)
        at org.broadinstitute.hellbender.utils.clipping.ReadClipper.hardClipSoftClippedBases(ReadClipper.java:332)
        at org.broadinstitute.hellbender.utils.clipping.ReadClipper.hardClipSoftClippedBases(ReadClipper.java:335)
        at org.broadinstitute.hellbender.tools.walkers.haplotypecaller.AssemblyBasedCallerUtils.finalizeRegion(AssemblyBasedCallerUtils.java:84)
        at org.broadinstitute.hellbender.tools.walkers.haplotypecaller.AssemblyBasedCallerUtils.assembleReads(AssemblyBasedCallerUtils.java:238)
        at org.broadinstitute.hellbender.tools.walkers.haplotypecaller.HaplotypeCallerEngine.callRegion(HaplotypeCallerEngine.java:480)
        at org.broadinstitute.hellbender.tools.walkers.haplotypecaller.HaplotypeCaller.apply(HaplotypeCaller.java:221)
        at org.broadinstitute.hellbender.engine.AssemblyRegionWalker.processReadShard(AssemblyRegionWalker.java:244)
        at org.broadinstitute.hellbender.engine.AssemblyRegionWalker.traverse(AssemblyRegionWalker.java:217)
        at org.broadinstitute.hellbender.engine.GATKTool.doWork(GATKTool.java:838)
        at org.broadinstitute.hellbender.cmdline.CommandLineProgram.runTool(CommandLineProgram.java:115)
        at org.broadinstitute.hellbender.cmdline.CommandLineProgram.instanceMainPostParseArgs(CommandLineProgram.java:170)
        at org.broadinstitute.hellbender.cmdline.CommandLineProgram.instanceMain(CommandLineProgram.java:189)
        at org.broadinstitute.hellbender.Main.runCommandLineProgram(Main.java:131)
        at org.broadinstitute.hellbender.Main.mainEntry(Main.java:152)
        at org.broadinstitute.hellbender.Main.main(Main.java:230)

The bed file:

Chr_04  0       268
Chr_04  2648    4654
Chr_04  4964    98377
Chr_04  102202  169423
Chr_04  169694  180201

I also attached an image showing the location in the BAM file that causes the error.

Could you please fix this error. Thank you.