diff --git a/Backend/Controllers/DeviceManageController.cs b/Backend/Controllers/DeviceManageController.cs
index 2f9aca4..64e9bed 100644
--- a/Backend/Controllers/DeviceManageController.cs
+++ b/Backend/Controllers/DeviceManageController.cs
@@ -1281,7 +1281,9 @@ namespace Backend.Controllers
                     {
                         //刪除原本的檔案
                         FolderFunction folderFunction = new FolderFunction();
-                        folderFunction.DeleteFile(Path.Combine(deviceKindFileSaveAsPath, deviceKind.Device_image));
+                        if (deviceKind.Device_image != null) { 
+                            folderFunction.DeleteFile(Path.Combine(deviceKindFileSaveAsPath, deviceKind.Device_image));
+                        }
 
                         var split = post.Device_image_file.FileName.Split(".");
                         var fileName = image_guid + "." + split[split.Length - 1];