diff --git a/apps/inm/services.py b/apps/inm/services.py
index c7a9d36e..4f05a2b7 100644
--- a/apps/inm/services.py
+++ b/apps/inm/services.py
@@ -325,7 +325,7 @@ class InmService:
             state = WMaterial.WM_OK
             if defect:
                 state = WMaterial.WM_NOTOK
-            mb, _ = MaterialBatch.objects.get_or_create(
+            mb, _ = MaterialBatch.safe_get_or_create(
                 material=material, 
                 warehouse=warehouse, 
                 batch=batch,