diff --git a/simnet/models/starrail/chronicle/challenge_boss.py b/simnet/models/starrail/chronicle/challenge_boss.py
index 53fc3be..30a6ecd 100644
--- a/simnet/models/starrail/chronicle/challenge_boss.py
+++ b/simnet/models/starrail/chronicle/challenge_boss.py
@@ -51,12 +51,17 @@ class StarRailChallengeBossBuff(APIModel):
 class StarRailChallengeBossFloorNode(APIModel):
     """Node for a floor."""
 
-    challenge_time: PartialTime
+    challenge_time: Optional[PartialTime] = None
     avatars: List[RogueCharacter]
     buff: Optional[StarRailChallengeBossBuff] = None
     score: int
     boss_defeated: bool
 
+    @property
+    def has_data(self) -> bool:
+        """Check if the node has data."""
+        return bool(self.avatars)
+
 
 class StarRailChallengeBossFloor(APIModel):
     """Floor in a challenge."""