ReactJS - Super Expression Must Either Be Null Or A Function, Not Undefined

I've been following along a course on udemy, but there's an error that keeps showing up no matter what I do: Here's the components code: import React from 'react'; import { Compon

Solution 1:

I had the same problem. The bug is due to 'react-sparklines' . Downgrade the version by:

npm i --save react-sparklines@1.6.0.

Solution 2:

Upon further inspection, it looks like the problem is in your Chart component as you're trying to access an undefined thisprops object in the component.

So, instead of data={thisprops.data}, it should be: data={props.data}.