Ionic Cannot read hasOwnProperty property from undefined

Question

I am using the Ionic framework. I upgraded to a later version of ion cli and got this error on startup ionic serve.

How to fix the problem to allow the project to work with ionic serveor ionic buildagain?

There was an error serving your Ionic application: TypeError: Cannot read property 'hasOwnProperty' of undefined
    at C:\Users\***\AppData\Roaming\npm\node_modules\ionic\lib\utils\npmScripts.js:16:31
    at _fulfilled (C:\Users\***\node_modules\q\q.js:834:54)
    at self.promiseDispatch.done (C:\Users\***\node_modules\q\q.js:863:30)
    at Promise.promise.promiseDispatch (C:\Users\***\node_modules\q\q.js:796:13)
    at C:\Users\***\node_modules\q\q.js:604:44
    at runSingle (C:\Users\***\node_modules\q\q.js:137:13)
    at flush (C:\Users\***\node_modules\q\q.js:125:13)
    at _combinedTickCallback (internal/process/next_tick.js:67:7)
    at process._tickCallback (internal/process/next_tick.js:98:9)