diff --git a/app/controllers/new_gestionnaire/recherche_controller.rb b/app/controllers/new_gestionnaire/recherche_controller.rb
index 0f7dcf159..58658a08b 100644
--- a/app/controllers/new_gestionnaire/recherche_controller.rb
+++ b/app/controllers/new_gestionnaire/recherche_controller.rb
@@ -4,10 +4,9 @@ module NewGestionnaire
       @search_terms = params[:q]
 
       # exact id match?
-      if @search_terms.to_i != 0
-        @dossiers = current_gestionnaire.dossiers.where(id: @search_terms.to_i) +
-          current_gestionnaire.dossiers_from_avis.where(id: @search_terms.to_i)
-        @dossiers.uniq!
+      id = @search_terms.to_i
+      if id != 0 && id_compatible?(id) # Sometimes gestionnaire is searching dossiers with a big number (ex: SIRET), ActiveRecord can't deal with them and throws ActiveModel::RangeError. id_compatible? prevents this.
+        @dossiers = dossiers_by_id(id)
       end
 
       if @dossiers.nil?
@@ -23,5 +22,22 @@ module NewGestionnaire
         ).results
       end
     end
+
+    private
+
+    def dossiers_by_id(id)
+      dossiers = current_gestionnaire.dossiers.where(id: id) +
+        current_gestionnaire.dossiers_from_avis.where(id: id)
+      dossiers.uniq
+    end
+
+    def id_compatible?(number)
+      begin
+        ActiveRecord::Type::Integer.new.serialize(number)
+        true
+      rescue ActiveModel::RangeError
+        false
+      end
+    end
   end
 end
diff --git a/spec/controllers/new_gestionnaire/recherche_controller_spec.rb b/spec/controllers/new_gestionnaire/recherche_controller_spec.rb
index 7e4a67039..4e3ac6288 100644
--- a/spec/controllers/new_gestionnaire/recherche_controller_spec.rb
+++ b/spec/controllers/new_gestionnaire/recherche_controller_spec.rb
@@ -36,6 +36,17 @@ describe NewGestionnaire::RechercheController, type: :controller do
           expect(assigns(:dossiers).count).to eq(0)
         end
       end
+
+      context 'with an id out of range' do
+        let(:query) { 123456789876543234567 }
+
+        it { is_expected.to have_http_status(200) }
+
+        it 'does not return the dossier' do
+          subject
+          expect(assigns(:dossiers).count).to eq(0)
+        end
+      end
     end
   end
 end