Exception error when exporting a row with null value using Copy Rows option of Data Grid. (4223980)

When trying to export a row with a Null value in a table, the following error appears:

"System.NullReferenceException
Object reference not set to an instance of an object."


The steps to reproduce this issue are:

1. Add a row to a table with the + button (Insert record)
2. Add some but not all values (i.e. at least one column with null value)
3. Save changes with "Save changes" butto
4. Right-click on the row and select "Copy rows".
5. Select "Include headers, insert statement..."
6. Click OK, then the exception appears.