[BUG] run npm update --save results in error if dependency is defined with `file:`

[alex-enchi]

Is there an existing issue for this?

• I have searched the existing issues

This issue exists in the latest npm version

• I am using the latest npm

Current Behavior

We have one of the local dependencies defined with file:../dependency Run of npm update --save results in

npm ERR! Cannot read properties of null (reading 'isRoot')

and package.json is not updated

Expected Behavior

update should skip file:../ dependencies and update properly package.json

Steps To Reproduce

just having one of dependencies defined as file:../ and run of npm update --save results in error

Environment

• npm: 8.5.1
• Node.js: v16.14.0
• OS Name: MacOs
• System Model Name:
• npm config: nothing worth mentioning