diff --git a/test/wrapper_test.rb b/test/wrapper_test.rb
index b94072d9c..5f168b011 100644
--- a/test/wrapper_test.rb
+++ b/test/wrapper_test.rb
@@ -3042,6 +3042,23 @@ def test_assert_applicable_for_vroom_if_initial_routes
     assert_empty OptimizerWrapper.config[:services][:vroom].inapplicable_solve?(vrp)
   end
 
+  def test_assert_can_handle_empty_quantities
+    problem = VRP.basic
+    problem[:relations] = [{
+      type: :shipment,
+      linked_ids: ['service_1', 'service_2']
+    }]
+    problem[:units] << { id: 'vol' }
+    problem[:vehicles].first[:capacities] = [{ unit_id: 'kg', limit: 2 }, { unit_id: 'vol', limit: 1 }]
+    problem[:services][0][:quantities] = [{ unit_id: 'kg', value: 1 }]
+    problem[:services][1][:quantities] = [{ unit_id: 'kg', value: -1 }]
+    problem[:services][2][:quantities] = [{ unit_id: 'vol', value: 1 }]
+    vrp = TestHelper.create(problem)
+
+    OptimizerWrapper.config[:services][:vroom].inapplicable_solve?(vrp)
+    OptimizerWrapper.config[:services][:ortools].inapplicable_solve?(vrp)
+  end
+
   def test_assert_inapplicable_relations
     problem = VRP.basic
     problem[:relations] = [{
@@ -3069,6 +3086,8 @@ def test_assert_inapplicable_relations
     }]
 
     vrp = TestHelper.create(problem)
+    assert_includes OptimizerWrapper.config[:services][:vroom].inapplicable_solve?(vrp),
+                    :assert_no_overall_duration
     assert_includes OptimizerWrapper.config[:services][:vroom].inapplicable_solve?(vrp),
                     :assert_no_relations_except_simple_shipments
     refute_includes OptimizerWrapper.config[:services][:ortools].inapplicable_solve?(vrp),
diff --git a/wrappers/vroom.rb b/wrappers/vroom.rb
index 6ca1a6b80..bc7d6f797 100644
--- a/wrappers/vroom.rb
+++ b/wrappers/vroom.rb
@@ -62,6 +62,7 @@ def solver_constraints
         :assert_vehicles_no_late_multiplier_or_single_vehicle,
         :assert_vehicles_no_overload_multiplier,
         :assert_vehicles_start_or_end,
+        :assert_no_overall_duration,
 
         # Mission constraints
         :assert_no_activity_with_position,
diff --git a/wrappers/wrapper.rb b/wrappers/wrapper.rb
index 1da4ec9c3..7f41d42f0 100644
--- a/wrappers/wrapper.rb
+++ b/wrappers/wrapper.rb
@@ -147,15 +147,15 @@ def assert_one_sticky_at_most(vrp)
 
     def assert_no_relations_except_simple_shipments(vrp)
       vrp.relations.all?{ |r|
-        return true if r.linked_ids.empty? && r.linked_vehicle_ids.empty?
-        return false unless r.type == :shipment && r.linked_ids.size == 2
+        next true if r.linked_ids.empty? && r.linked_vehicle_ids.empty?
+        next false unless r.type == :shipment && r.linked_ids.size == 2
 
         quantities = Hash.new {}
         vrp.units.each{ |unit| quantities[unit.id] = [] }
         r.linked_services.first.quantities.each{ |q| quantities[q.unit.id] << q.value }
         r.linked_services.last.quantities.each{ |q| quantities[q.unit.id] << q.value }
         quantities.all?{ |_unit, values|
-          [0, 2].include?(values.size) && values.first >= 0 && values.first == -values.last
+          values.empty? || (values.size == 2 && values.first >= 0 && values.first == -values.last)
         }
       }
     end