diff --git a/apps/inm/services.py b/apps/inm/services.py
index 49f6f965..b22d3577 100644
--- a/apps/inm/services.py
+++ b/apps/inm/services.py
@@ -132,9 +132,10 @@ def do_in(item: MIOItem):
         else:
             raise ParseError(f'{str(xmaterial)}-{xbatch}车间物料不足')
         
+        wm_production_dept = wm.mgroup.belong_dept if wm.mgroup else None
         if production_dept is None:
-            production_dept = wm.mgroup.belong_dept
-        elif production_dept != wm.mgroup.belong_dept:
+            production_dept = wm_production_dept
+        elif wm_production_dept and production_dept != wm_production_dept:
             raise ParseError(f'{str(xmaterial)}-{xbatch}车间物料不属于同一车间')
         # 增加mb
         if not is_zhj: