diff --git a/apps/wpm/serializers.py b/apps/wpm/serializers.py
index 59166913..86aa66db 100644
--- a/apps/wpm/serializers.py
+++ b/apps/wpm/serializers.py
@@ -1182,9 +1182,9 @@ class FmlogSerializer(CustomModelSerializer):
         read_only_fields = EXCLUDE_FIELDS
     
     def validate(self, attrs):
-        is_fix = attrs['is_fix']
+        is_fix = attrs.get("is_fix", False)
         if is_fix:
-            attrs["mgroup"] = None
+            attrs["mtask"] = None
         elif not attrs.get("mtask", None):
             raise ParseError("请选择任务")
         mtask: Mtask = attrs['mtask']