File cannot read property of undefined

I get an error when trying to load this specific file into the webviewer. The file loads but the error prevents me from using javascript code I have later.

PDF.js Express Version
You can replicate the error on the demo page with this document

Detailed description of issue

Expected behaviour
File to load without error.

Does your issue happen with every document, or just one?
With just this specific document

Link to document
T183-20-SIGNING PAGE ONLY(6).pdf (87.9 KB)

Code snippet
Throws an error on load, it happens on the demo page of this website too.

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Hi Eric,

I am able to reproduce this issue in version 7.3.0 (the version currently for our demo). However, I am not able to reproduce the error in version 7.3.1+. Can you update your package and let me know if the problem persists?