мда

IceCreamShop/IceCreamShop/ShopForm.cs

@@ -105,6 +105,7 @@ namespace IceCreamShop
                     Address = AddressTextBox.Text,
                     DateOpen = DateTimePicker.Value.Date,
                     MaxCapacity = Convert.ToInt32(CapacityUpDown.Value),
+                    ShopIceCreams = null
                 };
                 var operationResult = _id.HasValue ? _logic.Update(model) : _logic.Create(model);
                 if (!operationResult)