diff --git a/EquipMgr/Tnb.EquipMgr/ToolMoldsService.cs b/EquipMgr/Tnb.EquipMgr/ToolMoldsService.cs
index bb2d2b4a..ca540162 100644
--- a/EquipMgr/Tnb.EquipMgr/ToolMoldsService.cs
+++ b/EquipMgr/Tnb.EquipMgr/ToolMoldsService.cs
@@ -72,7 +72,12 @@ namespace Tnb.EquipMgr
 
         private async Task<dynamic> Update(string id, VisualDevModelDataUpInput visualDevModelDataUpInput)
         {
-            string? qrcode = visualDevModelDataUpInput.data.ContainsKey("qrcode") ? visualDevModelDataUpInput.data["qrcode"].ToString() : "";
+            string? qrcode = string.Empty;
+            if (visualDevModelDataUpInput.data.ContainsKey("qrcode") && visualDevModelDataUpInput.data["qrcode"] != null)
+            {
+                qrcode = visualDevModelDataUpInput.data["qrcode"].ToString();
+            }
+
             if (!string.IsNullOrEmpty(qrcode) && await _repository.AsSugarClient().Queryable<BasQrcode>().AnyAsync(x => x.code == visualDevModelDataUpInput.data["qrcode"] && x.source_id != id))
             {
                 throw Oops.Bah("二维码总表中已存在该二维码");