Map editor indefinite stall bug

Bug Report
Expected behavior
When I open the map editor, I expect it to run through the standard seven-stage process (connecting, loading countries, ect.) and in particular loading the country borders.

Actual behavior
The loading process stalls indefinitely at stage 6/7, and the error message "Error: Uncaught TypeError: Cannot read properties of undefined (reading 'forEach'), Script: [script link here]*, Line: 609, Column: 31)" appears.
*I have removed the script link, but can supply it if necessary.

Steps to reproduce the behavior
Attempted to open the map on another computer, same behaviour occurred.
Opening the map in the editor (or starting a new game) should/will cause the behaviour.

Information:
Browser:
Chrome (both times)

OS:
Windows

Any other relevant information:
The map name is "World of Eren"
Attachments:
(screenshot of the error message and the map loader at stage 6/7): https://prnt.sc/4PJWFSuSrDG4

Would it be possible for an admin/mod to roll back the save data to the latest version before 30/12/2024?

I sent Dave a message... I will let you know when I hear from him.

Wr1tt3n by Dippaladocalypse, 31.12.2024 at 22:42

Would it be possible for an admin/mod to roll back the save data to the latest version before 30/12/2024?

done