TypeError: Cannot read properties of undefined (reading 'startsWith') in v3+

[lpryszcz]

hi @jrobinso , I'm having issues when running v3+. console output:

Uncaught (in promise) TypeError: Cannot read properties of undefined (reading 'startsWith')
    at Bk.update (chromAliasDefaults.js:54:26)
    at new Bk (chromAliasDefaults.js:14:14)
    at Ck.init (genome.js:66:31)
    at async Ck.createGenome (genome.js:28:9)
    at async _k.loadReference (browser.js:750:53)
    at async _k.loadSessionObject (browser.js:620:9)
    at async Object.createBrowser (igv-create.js:78:18)
browser.js:2461 Uncaught (in promise) TypeError: Cannot read properties of undefined (reading 'length')
    at _k.Ek (browser.js:2461:33)

v2.15.13 works ok so it's not urgent.

greetings from Barcelona!