TypeError: thumbs[(thumbs.length - 1)] is undefined

[Eric Ehmke]

Receiving error:
TypeError: thumbs[(thumbs.length - 1)] is undefined

While setting direction={'column}. Looks like the error is coming from line 90 of Gallery.js

I am using the exact code from: https://codesandbox.io/s/awesome-bassi-5vn3lvz2n4?from-embed=&file=/index.js with the addition of direction={'column}