Exporting Test Step custom field of Number type is not working with Document Generator

Description: Exporting the Test Step custom field of Number type is not working with the Document Generator.

Pre-conditions: NA

How to reproduce

1. Create a Test Step custom field of number type.
2. Create a Test Case.
3. Create a Test Step under it and insert an entry in that number type Test Step custom field.
   
4. Now, try to export the Test Cases with the Document generator using a template like an offline Test Report.
5. Doc Gen, gives an error like below
   

Actual result/Attachments: Reports do not get generated.

Expected result: Reports should be generated.

Version

• xray:4.008.002

Workaround: NA