diff --git a/apps/mtm/serializers.py b/apps/mtm/serializers.py
index a9ef01ed..1985f1f2 100644
--- a/apps/mtm/serializers.py
+++ b/apps/mtm/serializers.py
@@ -233,6 +233,8 @@ class RouteSerializer(CustomModelSerializer):
         process = validated_data['process']
         routepack = validated_data.get('routepack', None)
         material_out_tracking = validated_data.pop("material_out_tracking", Material.MA_TRACKING_BATCH)
+        if material_out_tracking is None:
+            material_out_tracking = Material.MA_TRACKING_BATCH
         if routepack:
             pass
             # if Route.objects.filter(routepack=routepack, process=process).exists():
@@ -271,6 +273,8 @@ class RouteSerializer(CustomModelSerializer):
         validated_data.pop('material', None)
         process = validated_data.pop('process', None)
         material_out_tracking = validated_data.pop("material_out_tracking", Material.MA_TRACKING_BATCH)
+        if material_out_tracking is None:
+            material_out_tracking = Material.MA_TRACKING_BATCH
         with transaction.atomic():
             instance = super().update(instance, validated_data)
             material_out = instance.material_out