DSpace 7.6.1 DOI update command error

[Elaine Ding]

Hi there, 

We have installed DSpace 7.6.1  and set up the DOI configuration based on the document. 

When I run [dspace]/bin/dspace doi-organiser -u -q , it pops error message like:

Exception: Cannot invoke "org.dspace.content.DSpaceObject.getType()" because "dso" is null
java.lang.NullPointerException: Cannot invoke "org.dspace.content.DSpaceObject.getType()" because "dso" is null
        at org.dspace.identifier.doi.DOIOrganiser.update(DOIOrganiser.java:566)
        at org.dspace.identifier.doi.DOIOrganiser.runCLI(DOIOrganiser.java:271)

Anyone has idea ?

Thanks for help

Elaine