diff --git a/apps/wpm/serializers.py b/apps/wpm/serializers.py
index 110a7540..44e585d3 100644
--- a/apps/wpm/serializers.py
+++ b/apps/wpm/serializers.py
@@ -529,7 +529,7 @@ class MlogbInSerializer(CustomModelSerializer):
         fields = ['id', 'mlog', 'mtask', 'wm_in', 'count_use', 'count_pn_jgqbl',
                   'count_break', 'note', "parent"]
         extra_kwargs = {'count_use': {'required': True}, 'mtask': {'required': True},
-                        'wm_in': {'required': True, "allow_blank": False}}
+                        'wm_in': {'required': True, "allow_empty": False}}
     
     def validate(self, attrs):
         mlog: Mlog = attrs['mlog']