Plugin's CCEO does not have a parent

2021-03-02 14:28:53,325 ERROR [Long running task: Space removal long running task] [atlassian.confluence.event.ConfluenceEventDispatcher] run There was an exception thrown trying to dispatch event [com.atlassian.confluence.event.events.space.SpaceWillRemoveEvent[source=com.atlassian.confluence.spaces.DefaultSpaceManager@2413c797]] from the invoker [SingleParameterMethodListenerInvoker{method=public void com.atlassian.confluence.content.CustomContentSpaceRemovalListener.spaceIsBeingRemoved(com.atlassian.confluence.event.events.space.SpaceWillRemoveEvent), listener=com.atlassian.confluence.content.CustomContentSpaceRemovalListener@4555917d}
2(timed)]– space: 3178504 | url: /confluence/spaces/doremovespace.action | traceId: 690f0060eb2da92e | userName: ??? | referer: https://confluence.REDACTED.com/confluence/spaces/removespace.action?key=SB | action: doremovespace
3java.lang.RuntimeException: Listener: com.atlassian.confluence.content.CustomContentSpaceRemovalListener event: com.atlassian.confluence.event.events.space.SpaceWillRemoveEvent
4...
5Caused by: java.lang.NullPointerException
6at com.atlassian.confluence.content.DefaultCustomContentManager.removeAllPluginContentInSpace(DefaultCustomContentManager.java:295)
7at com.atlassian.confluence.content.CustomContentSpaceRemovalListener.spaceIsBeingRemoved(CustomContentSpaceRemovalListener.java:31)