diff --git a/danding_bot/plugins/group_horse_racing/commands/race.py b/danding_bot/plugins/group_horse_racing/commands/race.py
index 0049550..e9a3c56 100644
--- a/danding_bot/plugins/group_horse_racing/commands/race.py
+++ b/danding_bot/plugins/group_horse_racing/commands/race.py
@@ -7,6 +7,7 @@ from .shared import (
     _send_to_scope, _build_race_image_message,
     _get_user_name, _get_horses_in_order, _format_horse_label,
     run_race_with_settlement, points_service,
+    _is_admin_or_owner,
 )
 from ..models import RoomState, HorseState
 
@@ -64,17 +65,7 @@ async def handle_start(bot: Bot, event: Event):
             return
 
         is_participant = user_id in [h.owner_id for h in room.horses.values()]
-        is_admin = False
-        if isinstance(event, GroupMessageEvent):
-            try:
-                member_info = await bot.get_group_member_info(
-                    group_id=event.group_id, 
-                    user_id=int(user_id)
-                )
-                role = member_info.get("role", "")
-                is_admin = role in ("admin", "owner")
-            except Exception:
-                pass
+        is_admin = await _is_admin_or_owner(bot, event)
         
         if not is_participant and not is_admin:
             await start_cmd.finish("只有参赛者或群管理员可以开赛")
@@ -114,17 +105,7 @@ async def handle_cancel_race(bot: Bot, event: Event):
             return
 
         is_participant = user_id in [h.owner_id for h in room.horses.values()]
-        is_admin = False
-        if isinstance(event, GroupMessageEvent):
-            try:
-                member_info = await bot.get_group_member_info(
-                    group_id=event.group_id,
-                    user_id=int(user_id)
-                )
-                role = member_info.get("role", "")
-                is_admin = role in ("admin", "owner")
-            except Exception:
-                pass
+        is_admin = await _is_admin_or_owner(bot, event)
 
         if not is_participant and not is_admin:
             await cancel_race_cmd.finish("只有参赛者或群管理员可以取消比赛")
diff --git a/danding_bot/plugins/group_horse_racing/commands/shared.py b/danding_bot/plugins/group_horse_racing/commands/shared.py
index 4ab9cf8..75b8f96 100644
--- a/danding_bot/plugins/group_horse_racing/commands/shared.py
+++ b/danding_bot/plugins/group_horse_racing/commands/shared.py
@@ -132,6 +132,21 @@ def _describe_points_delta(delta: int) -> str:
     return "略有损失"
 
 
+async def _is_admin_or_owner(bot: Bot, event: Event) -> bool:
+    """Check if the event sender is a group admin or owner."""
+    if not isinstance(event, GroupMessageEvent):
+        return False
+    try:
+        member_info = await bot.get_group_member_info(
+            group_id=event.group_id,
+            user_id=int(event.get_user_id()),
+        )
+        return member_info.get("role", "") in ("admin", "owner")
+    except Exception:
+        return False
+
+
+
 def _build_point_changes(room: Room, odds: dict[str, float]) -> tuple[dict[str, int], dict[str, str]]:
     point_changes: dict[str, int] = {}
 
diff --git a/danding_bot/plugins/group_horse_racing/room_store.py b/danding_bot/plugins/group_horse_racing/room_store.py
index 1ee97f9..8a42a23 100644
--- a/danding_bot/plugins/group_horse_racing/room_store.py
+++ b/danding_bot/plugins/group_horse_racing/room_store.py
@@ -120,22 +120,28 @@ class RoomStore:
             room.champion_name = champion_name or ""
             room.tick_count = tick_count or 0
             # Restore horses
-            horses_data = json.loads(horses_json)
+            try:
+                horses_data = json.loads(horses_json) if horses_json else {}
+            except (json.JSONDecodeError, TypeError):
+                horses_data = {}
             for name, h_data in horses_data.items():
                 horse = Horse(
-                    owner_id=h_data["owner_id"],
-                    name=h_data["name"],
-                    index=h_data["index"],
+                    owner_id=h_data.get("owner_id", ""),
+                    name=h_data.get("name", name),
+                    index=h_data.get("index", 0),
                 )
                 horse.position = h_data.get("position", 0.0)
                 room.horses[name] = horse
             # Restore bets
-            bets_data = json.loads(bets_json)
+            try:
+                bets_data = json.loads(bets_json) if bets_json else []
+            except (json.JSONDecodeError, TypeError):
+                bets_data = []
             for b in bets_data:
                 room.bets.append(Bet(
-                    user_id=b["user_id"],
-                    horse_name=b["horse_name"],
-                    amount=b["amount"],
+                    user_id=b.get("user_id", ""),
+                    horse_name=b.get("horse_name", ""),
+                    amount=b.get("amount", 0),
                 ))
             room.next_horse_index = max((h.index for h in room.horses.values()), default=0) + 1
             self.rooms[scope] = room