diff --git a/app/Services/BiAngDeviceLogService.php b/app/Services/BiAngDeviceLogService.php
index fb6a2c5..7153fbd 100644
--- a/app/Services/BiAngDeviceLogService.php
+++ b/app/Services/BiAngDeviceLogService.php
@@ -38,7 +38,7 @@ class BiAngDeviceLogService
                 ]);
 
                 $device->update([
-                    'status' => $syncTime->subMinutes(60)->lt($log->reported_at) ? DeviceStatus::Online : DeviceStatus::Offline,
+                    'status' => $syncTime->copy()->subMinutes(60)->lt($log->reported_at) ? DeviceStatus::Online : DeviceStatus::Offline,
                 ]);
                 break;
             case DeviceType::Meteorological:
@@ -52,7 +52,7 @@ class BiAngDeviceLogService
                 ]);
 
                 $device->update([
-                    'status' => $syncTime->subMinutes(60)->lt($log->reported_at) ? DeviceStatus::Online : DeviceStatus::Offline,
+                    'status' => $syncTime->copy()->subMinutes(60)->lt($log->reported_at) ? DeviceStatus::Online : DeviceStatus::Offline,
                 ]);
                 break;