Test failed using test data "tgraph.vcf/fa"

[wjwei-handsome]

Hello，when I use command：
svaha2 -r tgraph.fa -v tgraph.vcf > test.gfa
to generate GFA file,I failed with the error info：

`FASTA index found for tgraph.fa
Parsed fasta index with 1 entries.
Loading variants from tgraph.vcf
Parsed 6 variants.
Created map of contig to breakpoints from variants.
Contig x has 12 breakpoints.

Adding max-node-length breakpoints.
Contig x has 14 breakpoints.
Sorted and uniquified breakpoints
Building reference backbone for x.
terminate called after throwing an instance of 'std::out_of_range'
what(): at: key not present
Aborted`

I need your help,please!