diff --git a/back/app/models/group.rb b/back/app/models/group.rb
index 80caa60f45f3..a490870c30c1 100644
--- a/back/app/models/group.rb
+++ b/back/app/models/group.rb
@@ -85,7 +85,10 @@ def self.membership_types
   private
 
   def generate_slug
-    self.slug ||= SlugService.new.generate_slug self, title_multiloc.values.first
+    self.slug ||= SlugService.new.generate_slug(
+      self,
+      title_multiloc.find { |_key, value| value.present? }&.last
+    )
   end
 
   def set_membership_type
diff --git a/back/spec/models/group_spec.rb b/back/spec/models/group_spec.rb
index 26a90b00d472..4623e215329b 100644
--- a/back/spec/models/group_spec.rb
+++ b/back/spec/models/group_spec.rb
@@ -69,4 +69,13 @@
       group.update_memberships_count!
     end
   end
+
+  describe 'generate_slug' do
+    it 'generates a slug based on the first non-empty locale' do
+      group = described_class.new
+      group.title_multiloc = { en: '', 'nl-BE': 'title', 'fr-BE': 'titlefrançais' }
+      group.send(:generate_slug)
+      expect(group.slug).to eq('title')
+    end
+  end
 end