diff --git a/SubMind.py b/SubMind.py
index a205e2d..f5e38ad 100644
--- a/SubMind.py
+++ b/SubMind.py
@@ -965,7 +965,21 @@ async def fallback_view_button(update: Update, context: CallbackContext):
 async def edit_start(update: Update, context: CallbackContext):
     query = update.callback_query
     await query.answer()
-    sub_id = query.data.split('_')[1]
+    sub_id_str = query.data.split('_')[1]
+    user_id = query.from_user.id
+
+    if not sub_id_str.isdigit():
+        await query.edit_message_text("错误：无效的订阅ID。")
+        return ConversationHandler.END
+
+    sub_id = int(sub_id_str)
+    with get_db_connection() as conn:
+        cursor = conn.cursor()
+        cursor.execute("SELECT 1 FROM subscriptions WHERE id = ? AND user_id = ?", (sub_id, user_id))
+        if not cursor.fetchone():
+            await query.edit_message_text("错误：找不到该订阅或无权限。")
+            return ConversationHandler.END
+
     logger.debug(f"Starting edit for sub_id: {sub_id}")
     context.user_data['sub_id_for_action'] = sub_id
     keyboard = [
@@ -1033,12 +1047,21 @@ async def edit_freq_value_received(update: Update, context: CallbackContext):
         await update.message.reply_text("请输入一个有效的正整数。")
         return EDIT_FREQ_VALUE
     unit = context.user_data.get('new_freq_unit')
-    sub_id = int(context.user_data.get('sub_id_for_action'))
+    try:
+        sub_id = int(context.user_data.get('sub_id_for_action'))
+    except (ValueError, TypeError):
+        await update.message.reply_text("错误：会话已过期，请重试。")
+        return ConversationHandler.END
+
     with get_db_connection() as conn:
         cursor = conn.cursor()
         cursor.execute("UPDATE subscriptions SET frequency_unit = ?, frequency_value = ? WHERE id = ? AND user_id = ?",
                        (unit, value, sub_id, user_id))
+        if cursor.rowcount == 0:
+            await update.message.reply_text("错误：找不到该订阅或无权限。")
+            return ConversationHandler.END
         conn.commit()
+
     await update.message.reply_text("✅ 周期已更新！")
     context.user_data.clear()
     await show_subscription_view(update, context, sub_id)
@@ -1122,6 +1145,10 @@ async def edit_new_value_received(update: Update, context: CallbackContext):
         cursor = conn.cursor()
         cursor.execute(f"UPDATE subscriptions SET {db_field} = ? WHERE id = ? AND user_id = ?",
                        (new_value, sub_id, user_id))
+        if cursor.rowcount == 0:
+            if message_to_reply:
+                await message_to_reply.reply_text("错误：找不到该订阅或无权限。")
+            return ConversationHandler.END
         conn.commit()
 
     if query:
@@ -1167,10 +1194,20 @@ async def remind_settings_start(update: Update, context: CallbackContext):
     query = update.callback_query
     await query.answer()
     sub_id_str = query.data.partition('_')[2]
+    user_id = query.from_user.id
+
     if not sub_id_str.isdigit():
         await query.edit_message_text("错误：无效的订阅ID。")
         return ConversationHandler.END
+
     sub_id = int(sub_id_str)
+    with get_db_connection() as conn:
+        cursor = conn.cursor()
+        cursor.execute("SELECT 1 FROM subscriptions WHERE id = ? AND user_id = ?", (sub_id, user_id))
+        if not cursor.fetchone():
+            await query.edit_message_text("错误：找不到该订阅或无权限。")
+            return ConversationHandler.END
+
     logger.debug(f"Starting reminder settings for sub_id: {sub_id}")
     context.user_data['sub_id_for_action'] = sub_id
     await _display_reminder_settings(query, context, sub_id)
@@ -1214,6 +1251,9 @@ async def remind_action_handler(update: Update, context: CallbackContext):
                 "WHERE id = ? AND user_id = ?",
                 (sub_id, user_id)
             )
+        if cursor.rowcount == 0:
+            await query.edit_message_text("错误：找不到该订阅或无权限。")
+            return ConversationHandler.END
         conn.commit()
     await _display_reminder_settings(query, context, sub_id)
     return REMIND_SELECT_ACTION
@@ -1232,6 +1272,9 @@ async def remind_days_received(update: Update, context: CallbackContext):
         with get_db_connection() as conn:
             cursor = conn.cursor()
             cursor.execute("UPDATE subscriptions SET reminder_days = ? WHERE id = ? AND user_id = ?", (days, sub_id, user_id))
+            if cursor.rowcount == 0:
+                await update.message.reply_text("错误：找不到该订阅或无权限。")
+                return ConversationHandler.END
             conn.commit()
         await update.message.reply_text(f"✅ 提前提醒天数已设置为: {days}天。")
         context.user_data.clear()