Failed to parse public key for package

I am getting this error, and don’t know what to do about it:
failed to parse public key for /var/cache/PackageKit/9.2/metadata/nodesource-nsolid-9-x86_64.tmp/NODESOURCE-NSOLID-GPG-SIGNING-KEY-EL

The error is coming up when I check “Software Updates” in the Cockpit Web Console. Nothing is coming up in /var/log/nginx/error_cockpit.log, nor /var/log/nginx/error.log.

Since it’s in the cache folder, I tried dnf clean all, didn’t help.

Do I need to remove the package and reinstall, or what? Thanks for any help.