diff --git a/app/controllers/champs/carte_controller.rb b/app/controllers/champs/carte_controller.rb
index 857970ac2..9746896a5 100644
--- a/app/controllers/champs/carte_controller.rb
+++ b/app/controllers/champs/carte_controller.rb
@@ -28,7 +28,7 @@ class Champs::CarteController < ApplicationController
     geo_areas = []
     geo_json = geo_json.blank? ? [] : JSON.parse(geo_json)
 
-    if geo_json.first == ["error", "TooManyPolygons"]
+    if geo_json.empty?
       @error = true
       @champ.value = nil
       @champ.geo_areas = []
diff --git a/app/javascript/shared/carte.js b/app/javascript/shared/carte.js
index 5a86af744..1c7d7655e 100644
--- a/app/javascript/shared/carte.js
+++ b/app/javascript/shared/carte.js
@@ -115,7 +115,7 @@ export function addFreeDrawEvents(map, selector) {
     } else if (polygonArea(latLngs) < 300000) {
       input.value = JSON.stringify(latLngs);
     } else {
-      input.value = '{ "error": "TooManyPolygons" }';
+      input.value = '';
     }
 
     fire(input, 'change');
diff --git a/spec/controllers/champs/carte_controller_spec.rb b/spec/controllers/champs/carte_controller_spec.rb
index 267f6d3b2..9bd6c7627 100644
--- a/spec/controllers/champs/carte_controller_spec.rb
+++ b/spec/controllers/champs/carte_controller_spec.rb
@@ -50,7 +50,7 @@ describe Champs::CarteController, type: :controller do
 
     context 'when error' do
       let(:geojson) { [[{ "lat": 48.87442541960633, "lng": 2.3859214782714844 }, { "lat": 48.87273183590832, "lng": 2.3850631713867183 }, { "lat": 48.87081237174292, "lng": 2.3809432983398438 }, { "lat": 48.8712640169951, "lng": 2.377510070800781 }, { "lat": 48.87510283703279, "lng": 2.3778533935546875 }, { "lat": 48.87544154230615, "lng": 2.382831573486328 }, { "lat": 48.87442541960633, "lng": 2.3859214782714844 }]] }
-      let(:selection) { { error: "TooManyPolygons" } }
+      let(:selection) { '' }
 
       it {
         expect(champ.reload.value).to eq(nil)