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npm outdated -g --depth=0 gives err! Cannot read property 'length' of undefined

As you can see it in the following image, when I run npm outdated -g --depth=0 it returns an error.
How can I fix this?

Ok, I uninstall eslint and reinstall it again. Then it does not give any error.

Thanks for update. A matching issue was reported previously here, and there is a fix coming: 'npm outdated' throw an error (Cannot read property 'length' of undefined)

Landing soon: Release: npm@6.9.1-next.0

Thanks. Updating to npm 6.9.1 fixed the problem. npm i -g npm@next.