Javascript error presented when moving main XEA windows with pop-up open

Description
When moving the main XEA windows with the Precondition pop-up open, there´s a Javascript error presented, and if you try to close it, it continues to show for few times until you can close it.

Preconditions
Create a Precondition issue on Jira so that you can later add it to the Test Session on XEA

How to reproduce

1. Open XEA and connect it to a Jira instance
2. Start a New Session
3. Select a project and add a Summary to the Test
4. Add a Precondition
5. Click on the Precondition, so it opens the pop-up with the Precondition details
6. Try to drag/move the main XEA window

Actual result/Attachments
It shows the following Javascript error.

Expected result
It should be able to drag/move the XEA main windows