diff --git a/Src/Dlhis.Basic/Device/Response/DevicePermissionManuallyResponse.cs b/Src/Dlhis.Basic/Device/Response/DevicePermissionManuallyResponse.cs
index e7504b4f..d421f4c4 100644
--- a/Src/Dlhis.Basic/Device/Response/DevicePermissionManuallyResponse.cs
+++ b/Src/Dlhis.Basic/Device/Response/DevicePermissionManuallyResponse.cs
@@ -12,6 +12,18 @@ public class DevicePermissionManuallyResponse
     public string UserNo { get; set; }
     public string UserName { get; set; }
 
-    public DeviceTypeEnumType Type { get; set; }
-    public string TypeDesc => Type.GetDescription();
+    public DeviceTypeEnumType? Type { get; set; }
+
+    public string TypeDesc
+    {
+        get
+        {
+            if (Type == null)
+            {
+                return string.Empty;
+            }
+
+            return Type.GetDescription();
+        }
+    }
 }
\ No newline at end of file