An exception occurs when associating a Test Plan with a Test Execution

Description
A NullPointerException occurs when editing an existing Test Execution to associate a Test Plan.

Pre-conditions
Install Jira 9.15

How to reproduce

1. Open a Test Execution
2. Try to add a Test Plan or Try edit the Test Execution issue with all custom fields

Actual result/Attachments
A NPE occurs

Version

• Xray 7.5.2