Running 'razor nodes nodeNNN tags' produces an error

When I run 'razor nodes nodeNNN tags', I get

Error: undefined method `[]' for nil:NilClass
Try 'razor --help' for more information

both for nodes with and w/o associated tags. If there are tags, the output should have the same format as 'razor tags'; if there are none associated with the node, the output should be 'no tags apply to this node'