Uncaught Type error when using "Show/hide columns" in a Forms configuration for lookup field

Hi Everyone,

This was working absolutely fine a month ago. I am using SharePoint "Show/hide column" feature to hide Lookup field. This stopped working when I came back to edit the formula recently.

When clicked on "Save" button, I get Uncaught error in browser console. Seems like a bug with any latest update on SharePoint online. But still wanted to check here.

Please anyone if aware of this problem or knows any solutions/workaround do let me know. 

Thanks,

Kundal