diff --git a/apps/wpm/serializers.py b/apps/wpm/serializers.py
index e025c4c6..6a21170c 100644
--- a/apps/wpm/serializers.py
+++ b/apps/wpm/serializers.py
@@ -688,7 +688,7 @@ class MlogbInSerializer(CustomModelSerializer):
                         'wm_in': {'required': True, "allow_empty": False}}
     
     def validate(self, attrs):
-        if attrs["count_use"] < 0 or attrs["count_pn_jgqbl"] < 0 or attrs["count_break"] < 0:
+        if attrs["count_use"] < 0 or attrs["count_pn_jgqbl"] < 0 or attrs.get("count_break", 0) < 0:
             raise ParseError('存在负数!')
         mlog:Mlog = attrs['mlog']
         is_fix = mlog.is_fix