Insert value NULL destination script wpcopytables

[Sistemas Sistemas]

I am migrating a sqlserver DB to mysql using workbench generating the script with wbcopytables.

In the destination I have fields that are not there in the source and that are varchar default null

Is it possible to keep these null values? Because the script forces me to put a string or else it gives me an error and I need to keep the null value, not put a null string or another string.

Regards.