Javascript error in Safari

Hi,

This is a really cool module and it works fine for us in most situations. We're using the Leaflet API via IPGV&M, along with an exposed proximity filter.

We're getting the following error in Safari 5.1.10 (on iMac) as soon as we tick 'Allow session storage' in admin/config/system/ip_geoloc :

Error: Invalid LatLng object: (52.3702157, NaN)
(in the Leaflet library JS)

No marker for the current user is shown on the map, even though the proximity filter appears to be working. It's also breaking a load of other JS functions, such as language and currency selectors.

This problem doesn't occur in Firefox, nor in Safari for iOS.

(The error goes away when unticking 'Allow session storage', but of course that's precisely what we're trying to do here.)

Has anyone else come across this problem? Any suggestions much appreciated.

Thanks