diff --git a/hb_server/apps/em/services.py b/hb_server/apps/em/services.py
index 0c1eba4..5e1781c 100644
--- a/hb_server/apps/em/services.py
+++ b/hb_server/apps/em/services.py
@@ -8,8 +8,8 @@ class EmService:
     def update_check_date(cls, equip:Equipment):
         # 根据校准检定记录变更下次日期
         check = ECheckRecord.objects.filter(equipment=equip).order_by('id').last()
-        equip.check_date = check.check_date
         if check:
+            equip.check_date = check.check_date
             if equip.cycle:
                 equip.next_check_date = equip.check_date + relativedelta(months=equip.cycle)
             else: