Valid ISBN13's occasionally fail

[colewinans]

I haven't found the source of this issue yet.

Occasionally, valid ISBN13's will fail.

Example code:

var ISBN = require("isbnjs")
var isbn13 = ISBN.parse('9789999929257');
isbn13.asIsbn13();

Results in TypeError: Cannot read property 'asIsbn13' of null

This is a valid ISBN13, yet it fails.

See Runkit to test: https://runkit.com/colewinans/5974bdeb4f0fa8001229d426

[Abekonge]

Perhaps related to #6?

Since all ISBN groups are not included unless you manually import isbn-groups.js, all isbns from isbn-regions other than japan and english-speaking territories will fail.

[GitBruno]

How do you know the ISBN is valid? 978-99981 seems to be the last possible group. Therefore I can conclude the ISBN is not valid. See range

@Abekonge In this particular instance it is unrelated.