diff --git a/api/models/model.py b/api/models/model.py
index 2536f1e214..4b6e35140d 100644
--- a/api/models/model.py
+++ b/api/models/model.py
@@ -97,7 +97,7 @@ class App(Base):
     created_by = mapped_column(StringUUID, nullable=True)
     created_at = mapped_column(db.DateTime, nullable=False, server_default=func.current_timestamp())
     updated_by = mapped_column(StringUUID, nullable=True)
-    updated_at = mapped_column(db.DateTime, nullable=False, server_default=func.current_timestamp())
+    updated_at: Mapped[datetime] = mapped_column(db.DateTime, nullable=False, server_default=func.current_timestamp())
     use_icon_as_answer_icon = mapped_column(db.Boolean, nullable=False, server_default=db.text("false"))
 
     @property
diff --git a/api/services/app_service.py b/api/services/app_service.py
index 0a08f345df..13440b6526 100644
--- a/api/services/app_service.py
+++ b/api/services/app_service.py
@@ -227,11 +227,11 @@ class AppService:
         :param args: request args
         :return: App instance
         """
-        app.name = args.get("name")
+        app.name = args.get("name", "")
         app.description = args.get("description", "")
         app.icon_type = args.get("icon_type", "emoji")
-        app.icon = args.get("icon")
-        app.icon_background = args.get("icon_background")
+        app.icon = args.get("icon", "")
+        app.icon_background = args.get("icon_background", "")
         app.use_icon_as_answer_icon = args.get("use_icon_as_answer_icon", False)
         app.max_active_requests = args.get("max_active_requests")
         app.updated_by = current_user.id