I'm getting this error all of a sudden when trying to add markers to a map in the CP:

Uncaught TypeError: this.lat is not a function

I've previously followed all of the advice on devot-ee about using a previous version of the Google Maps API, but this has now happened despite doing that.

Any advice on how to work around this?


2 Answers 2


The following fix works for me. The project in which I'm using this fieldtype does not require the use of most of the product's more advanced features so I can't guarantee that it fixes everything. Nor can I guarantee that it won't break something else. But hey, it's a start :-)

Open up /themes/third_party/gmap/javascript/gmap_field.js and search for "var updateValues". (The line number will vary depending on your addon version.) Modify the code as follows:

// @HACK VMG 2016-05-26
// Fixes "this.lat is not a function" error caused by
// the response object containing float values for lat
// and lng instead of a LatLng object.
$.each(response.markers.results, function(i, result) {
    response.markers.results[i].geometry.location = new google.maps.LatLng(result.geometry.location.lat, result.geometry.location.lng);
$.each(response.waypoints.results, function(i, result) {
    response.waypoints.results[i].geometry.location = new google.maps.LatLng(result.geometry.location.lat, result.geometry.location.lng);
$.each(response.regions.results, function(i, result) {
    response.regions.results[i].geometry.location = new google.maps.LatLng(result.geometry.location.lat, result.geometry.location.lng);
var updateValues = [

Hopefully that helps others of you who are facing the same problem.

  • Life saver! This worked for me. Commented May 26, 2016 at 22:06
  • This worked great for me on Google Maps for EE 3.3.8. Thanks Mr Wilson! :-)
    – Stephen
    Commented May 27, 2016 at 10:05
  • Nice one. This coupled with the fix below (it must be v3.22) worked for me.
    – liamcrean
    Commented Aug 17, 2016 at 9:56
  • Using the various fixes already mentioned the individual entries are working, but I still can't get the Importer to run correctly (whether it's 10 or 1000's of entries). The importer / geocoder still shows the error "this.lat is not a function"?
    – christiaan
    Commented May 15, 2017 at 6:15

You may have already tried this. This fix worked for me a while ago (I just checked - and GMAPS is still working fine on the site this fix was applied to).

Around line 180 in this file: system/expressionengine/thirdparty/gmap/ft.gmap.php





  • Thanks Jules, yes, this change was already in place prior to the problem appearing. Commented May 26, 2016 at 1:31
  • I've also noticed this same issue happening in the last day or so on all the sites I have that use Google Maps for EE. I was also using the previous patch that was listed on Devot-ee: devot-ee.com/add-ons/support/google-maps/viewthread/15475
    – Stephen
    Commented May 26, 2016 at 10:40
  • I was just going to post that I did the same fix, but when checking the site now I see that this error is back. I also get this warning in my console "Google Maps API warning: RetiredVersion developers.google.com/maps/documentation/javascript/…" Commented May 26, 2016 at 17:06
  • Hello, Solutions explain above are works in past. None of this is working now. Do any one have some solution ? I have gmap 3.3.9 Commented Oct 6, 2016 at 10:43
  • It's best to change the line above to $this->EE->theme_loader->javascript('maps.google.com/maps/api/js?v=3&sensor=true');. This ensures that you're using the latest of API V3. I think v=3.24 and below have now been retired. Commented Nov 15, 2016 at 12:06

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