diff --git a/YD_AllHeartRates.Api/Mqtt/MqttBackgroundService.cs b/YD_AllHeartRates.Api/Mqtt/MqttBackgroundService.cs
index 6845adc..701a9dc 100644
--- a/YD_AllHeartRates.Api/Mqtt/MqttBackgroundService.cs
+++ b/YD_AllHeartRates.Api/Mqtt/MqttBackgroundService.cs
@@ -144,11 +144,14 @@ namespace YD_AllHeartRates.Api.Mqtt
                         var payload = JsonSerializer.Deserialize<BlePayload>(msg.Payload, _jsonOpt);
                         if (payload == null || payload.devices == null || payload.devices.Count == 0) return;
 
-                        var scoreTime = DateTime.ParseExact(payload.send_time, "yyyy-MM-dd HH:mm:ss", CultureInfo.InvariantCulture);
+                        DateTime scoreTime;
 
-                        // 如果时间 < SQL Server datetime 最小值，则用当前时间代替
-                        if (scoreTime < (DateTime)System.Data.SqlTypes.SqlDateTime.MinValue)
+                        if (string.IsNullOrWhiteSpace(payload.send_time)
+                            || !DateTime.TryParseExact(payload.send_time, "yyyy-MM-dd HH:mm:ss",
+                                CultureInfo.InvariantCulture, DateTimeStyles.None, out scoreTime)
+                            || scoreTime < (DateTime)System.Data.SqlTypes.SqlDateTime.MinValue)
                         {
+                            // 解析失败或时间非法 → 使用当前时间
                             scoreTime = DateTime.Now;
                         }