Unable to export filtered Test Plans in Test Plans board

Description
When we attempt to export filtered Test Plans via the search bar on the Test Plans page within the Testing board, an error occurs:
"An error occurred while generating your report. Please, contact the support team."

Pre-conditions

• Have 2 or more test plans
• Have a template to export test plans setup ** 

How to reproduce

1. Go to "Test Plans" inside the Testing Board
2. Filter by issue key or name
3. Export using Document Generator 

Actual result/Attachments

We get the error:

Expected result
Would export the document with the filtered test plan/s