fix

KOP/Ivanov_visual_components/ItemTable.cs

@@ -75,7 +75,7 @@ namespace Ivanov_visual_components
                 if (propIsExist)
                 {
                     object value = DataGridViewItems.SelectedRows[0].Cells[columnIndex].Value;
-                    properties.SetValue(val, Convert.ChangeType(value, properties?.PropertyType));
+                    properties.SetValue(val, Convert.ChangeType(value, properties.PropertyType));
                 };
             }