I am using Magento2.1.9 getting this
error in our
console i am trying to different solutions but not fix it.please if any one know reply me
It turns out that customer-data.js uses the localStorage to store a variety of stuff (probably for caching purposes). This means that when a module (or Magento) updates, you'd better make sure to flush your local storage as well.
Reference - You can find some more solution here :