Hi,

I'm trying to run bcftools stats on multiple chromosomes and then have 
plot-vcfstats give me a single plot that shows the data for each of of the 
chromosomes. I've got one vcf file per chromosome. If I run plot-vcfstats on 
one file, it's fine. If I try to fun on multiple files, it breaks.

Input:
plot-vcfstats -p Chr_all/ Chr12-1-133851895.vcf.gz_stats.txt 
ChrX-1-155270560.vcf.gz_stats.txt

Error message:
Parsing bcftools stats output: Chr12-1-133851895.vcf.gz_stats.txt
Parsing bcftools stats output: ChrX-1-155270560.vcf.gz_stats.txt
Illegal division by zero at 
/usr/local/Cluster-Apps/bcftools/1.2/bin/plot-vcfstats line 480.

This happens regardless of what combination of input files I use. All input 
files I have tested will run fine in plot-vcfstats individually, but will throw 
this divide by zero exception if I pass more than one as an argument to 
plot-vcfstats

I have tried merging them in the hope of avoiding this, but got the exact same 
error as above.
Command for merge:
plot-vcfstats -m Chr12-1-133851895.vcf.gz_stats.txt 
ChrX-1-155270560.vcf.gz_stats.txt

Can anyone help me sort this out, or suggest a workaround if this is a bug?
-James
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