Error exporting a Select List(Multiple) Test Step Custom field

Description
When exporting a Select List(Multiple) Test Step Custom field there´s an error and Doc Gen is unable to generate the report.

Pre-conditions
Create a Select List(Multiple) Test Step Custom field

How to reproduce
Create the Test Step Custom field with Select List(Multiple) type.

Try to export it with the following mapping:

Actual result/Attachments

Expected result
It should print the Test Step custom field value