robfletcher/grails-fields — comment on commit b4290696013b9586c49ec8df6c942042a1784ca9
File: test/unit/grails/plugin/formfields/DomainClassPropertyAccessorSpec.groovy line 159
By sbglasius:

Yes, this is it, and the author is null. For my case, I was trying to access the id of author, could that make a difference?