WebGL - Uncaught TypeError: Cannot read property 'toLowerCase' of null

Development Platform & Builds
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Hi!

I have a very simple UE program that I am trying to deploy do my website. I can run it perfectly on my PC local host but not when its hosted on my website. It is deployed there correctly but when I launch I get the error:
“Uncaught TypeError: Cannot read property ‘toLowerCase’ of null”.

297923-error.png
297923-error.png1893×778 45.2 KB

NOTE: I tried with a ‘development’ build, with that it works but not with a packaged build.

Any help please?
Thank you!