The reason seems to be a bad npm-shrinkwrap.json (listing versions not covered by package.json) @julian
@tomanagle to get it running it's the easiest to remove the npm-shrinkwrap.json and run ./nodebb upgrade once more.
EDIT: Reported on github: gh#4310 Thanks for reporting!
ghost created this issue in NodeBB/NodeBB closed v1.x.x outdated shrinkwrap #4310