Getting one error only on a particular machine!

This error is occuring only on a particular machine. Web application is hosted on staging server for testing purpose but in a particular machine only . Pdfjs-express(latest) is giving this error.

TypeError: Cannot Read property ‘Cb’ of null.

Can anyone guide what’s the issue?
Tried in Google Chrome browser. Tried clearing default setttings in chrome and also tried in Incognito mode. All extensions removed.
Tried in Firefox too. there it gives Cannot Read ‘e’ of null.

Hi there! Sorry for the delay on this response.

Seems to me like its a timing issue somewhere and not a machine issue. Can you provide a code sample for how you are loading PDF.js Express, and any other APIs you are using? When in your app lifecycle does this error occur?