@patrick-sébastien-coulombe that appears to be this issue, which doesn't seem to be fixed yet.
You should be able to fix it, at least temporarily, by modifying them manually in the ACP. Name should be [[global:header.categories]]
When I run
git reset --hard origin/v0.9.3 (Upgrading from 0.9.1)
atal: ambiguous argument 'origin/v0.9.3': unknown revision or path not in the working tree.
Use '--' to separate paths from revisions, like this:
'git <command> [<revision>...] -- [<file>...]'
and then when I run ./nodebb upgrade, I get this error:
Or backup your nodebb dir and overwrite using the latest Git master zip. They say its not supported but worked several versions for me.