Script Listeners error

[Emily Ashley]

We have three existing script listeners that don't have errors in the script itself but they are not running.  When I select 'preview' I can see the output but when I then select 'Update' i get the following error message:

Error: com.atlassian.event.internal.LockFreeEventPublisher.unregisterListener(java.lang.String)

We've recently upgraded to version 8.20.10 and am wondering if there is something causing this issue as the listeners were working as they should.  I've checked the ScriptRunner website and cant see anything obvious there.  Is there a resolution for this?