Nulpointer exception when moving a Test into a folder in the Test Plan Board

Description
When moving a Test case into a folder in the Test Plan Board it returns a nullpointer exception.

How to reproduce

1. Open a Test Plan Board
2. Move (drag and drop) a Test case into a folder

Actual result/Attachments
Error returned in the screen:
java.lang.NullPointerException
at com.xpandit.raven.repository.FolderRepositoryImpl.b(Unknown Source)

Expected result
The Test case is moved into the folder without any error

Version

• Xray 4.2.9