diff --git a/ArknightsUID/utils/models/skland/models.py b/ArknightsUID/utils/models/skland/models.py
index 961eeb0..20ab8b9 100644
--- a/ArknightsUID/utils/models/skland/models.py
+++ b/ArknightsUID/utils/models/skland/models.py
@@ -369,12 +369,12 @@ class BuildingTraining(Struct):
     slotId: str
     level: int
     trainee: BuildingTrainingTrainee
-    trainer: BuildingTrainingTrainer
     remainPoint: float
     speed: float
     lastUpdateTime: int
     remainSecs: int
     slotState: int
+    trainer: BuildingTrainingTrainer | None = None
 
 
 class BuildingHire(Struct):