Uncaught SyntaxError: Lexical declaration cannot appear in a single-statement context

This MR fixes the problem for me. Changing the variable from let to var was the solution.

Thanks @JeroenT, committed into 3.x dev branch, will be part of the next Geofield Map release.

Automatically closed - issue fixed for 2 weeks with no activity.

itamair → closed merge request !13