Uncaught TypeError: Cannot read properties of null (reading 'isCE')

This error occurs when you are trying to access a property or method of an object that is null or undefined.

For example, if you have the following code:

let myObject = null;
console.log(myObject.isCE);

You will get the "Uncaught TypeError: Cannot read properties of null (reading 'isCE')" error because myObject is null and does not have an isCE property.

To fix this error, you should check if the object is null or undefined before accessing its properties or methods.

Here's an example of how you can fix the above code:

let myObject = null;
if (myObject !== null && myObject !== undefined) {
  console.log(myObject.isCE);
}

This code checks if myObject is not null and not undefined before trying to access its isCE property.