diff --git a/apps/mtm/serializers.py b/apps/mtm/serializers.py
index f13b0679..93485e14 100644
--- a/apps/mtm/serializers.py
+++ b/apps/mtm/serializers.py
@@ -158,7 +158,7 @@ class RouteSerializer(CustomModelSerializer):
             material_out = instance.material_out
             if material_out:
                 if material_out.process is None:
-                    material_out.process = instance.process
+                    material_out.process = process
                     if instance.material:
                         material_out.parent = instance.material
                     material_out.save()
@@ -177,7 +177,7 @@ class RouteSerializer(CustomModelSerializer):
             material_out = instance.material_out
             if material_out:
                 if material_out.process is None:
-                    material_out.process = instance.process
+                    material_out.process = process
                     if instance.material:
                         material_out.parent = instance.material
                     material_out.save()