comdoc panic: runtime error: index out of range [-2]

package main

import (
    "io"
    "net/http"
    "os"

    "github.com/sassoftware/relic/v7/lib/comdoc"
)

func main() {
    f, err := os.CreateTemp("", "")
    if err != nil {
        panic(err)
    }
    resp, err := http.Get("https://github.com/decalage2/oletools/raw/master/tests/test-data/encrypted/dde-test-encrypt-standardpassword.xls")
    if err != nil {
        panic(err)
    }
    defer resp.Body.Close()
    if _, err := io.Copy(f, resp.Body); err != nil {
        panic(err)
    }

    doc, err := comdoc.WriteFile(f)
    if err != nil {
        panic(err)
    }

    var b [10000]byte
    if err := doc.AddFile("file", b[:]); err != nil {
        panic(err)
    }
    if err := doc.Close(); err != nil {
        panic(err)
    }
}

➜  asd git:(master) ✗ go run main.go
panic: runtime error: index out of range [-2]

goroutine 1 [running]:
github.com/sassoftware/relic/v7/lib/comdoc.freeSectors(...)
    /Users/gabriel.vasile/go/1.20.3/pkg/mod/github.com/sassoftware/relic/v7@v7.5.5/lib/comdoc/sectors.go:71
github.com/sassoftware/relic/v7/lib/comdoc.(*ComDoc).writeShortSAT(0x4?)
    /Users/gabriel.vasile/go/1.20.3/pkg/mod/github.com/sassoftware/relic/v7@v7.5.5/lib/comdoc/shortsector.go:51 +0x2e8
github.com/sassoftware/relic/v7/lib/comdoc.(*ComDoc).Close(0x1400006c000)
    /Users/gabriel.vasile/go/1.20.3/pkg/mod/github.com/sassoftware/relic/v7@v7.5.5/lib/comdoc/writer.go:87 +0x80
main.main()
    /Users/gabriel.vasile/tmp/comdocf/asd/main.go:34 +0x188
exit status 2

sassoftware / relic

comdoc panic: runtime error: index out of range [-2] #30