diff --git a/apps/inm/correct.py b/apps/inm/correct.py
index 4debaf28..c597f74f 100644
--- a/apps/inm/correct.py
+++ b/apps/inm/correct.py
@@ -8,12 +8,13 @@ def correct_material_batch():
     mgroups = Mgroup.objects.all()
     p_dict = {}
     for mgroup in mgroups:
-        processId = mgroup.process.id
-        dept: Dept = mgroup.belong_dept
-        if processId not in p_dict:
-            p_dict[processId] = dept
-        else:
-            raise ParseError('存在多个同工序的工段：{}'.format(mgroup.name))
+        if mgroup.process:
+            processId = mgroup.process.id
+            dept: Dept = mgroup.belong_dept
+            if processId not in p_dict:
+                p_dict[processId] = dept
+            else:
+                raise ParseError('存在多个同工序的工段：{}'.format(mgroup.name))
     mbs = MaterialBatch.objects.filter(material__type__in=[Material.MA_TYPE_GOOD, Material.MA_TYPE_HALFGOOD], 
     production_dept=None)
     for mb in mbs: