diff --git a/Controllers/AuthApiController.cs b/Controllers/AuthApiController.cs
index 297574d2..870d073b 100644
--- a/Controllers/AuthApiController.cs
+++ b/Controllers/AuthApiController.cs
@@ -300,6 +300,11 @@ namespace QuotationMaker.Controllers
                     string modelMainItem_name = item.modelMainItem_name;
                     string modelMainItem_ac = item.modelMainItem_ac;
 
+                    if (modelMainItem_ac == "") {
+                        modelMainItem_ac = "0";
+                    }
+
+
                     if (mainItem_method == "add") {
                         modelMainItem_uid = GlobalClass.CreateRandomCode(24);