# What / Why > Angular 9.0.2 > NodeJS: 13.9.0 > npm: 6.13.7 ## When * Whenever I install an npm package with an existing package-lock.json * After typing `git push heroku master` ## Where * https://github.com/theADAMJR/kittenoverflow -> source of bug ## How * https://pastebin.com/rB36VJGu -> log of error ### Current Behavior * Failure to deploy on Heroku (most of the time) ### Steps to Reproduce * Install any npm package with package-lock.json (using this project) ### Expected Behavior * TypeError: Cannot read property 'match' of undefined ## Who * Me ## References * n/a