Doens't show options on admin backoffice

Hi,

I’m using this plugin of Google Maps for WP. The plugin worked well for me. Now, I was into the admin panel to add another location to the map, and no list of them.. The list of locations, maps, disappeared or are not showing because they are still created, and the map on the website appears normally.

I have an error in jQuery which I saw with FireBug:
“TypeError: a is null
…b[u]+b.G);Va(c,b[C]+b.D)}function Xj(a){return new W(a[Ab],a[Gc])};function Yj(a…”

The error is on the file main.js. I didn’t make the file, so I don’t know how to solve it.

Any idea?

Thanks.

https://www.ads-software.com/plugins/wp-google-map-plugin/