Can't Edit Page with Upfront

I cannot edit a page in the website, possibly due to a map loading error. Upfront begins to load and shows "Rendering 17%" but gets stuck there and never completes.

The issue came up when adding a map element to a page using Upfront editor. For some reason the element did not accept entry of an address/location for the map. I just left it blank and returned to the page to try again, but could not load Upfront due to the error.

I have tested the page in view mode and the map fails to load. I assume the map is trying to load in edit mode but as it fails, the rendering does not complete. How can I edit the page to remove the element if it is causing the editor to get stuck on loading? Help!

I have granted access and attached a screenshot.