Hi,

It looks like you're trying to call the difference method on this._tables, but you’re encountering an error. Here's what might be going wrong:

This assumes this._tables is not null or undefined, but if it is, trying to access .difference will throw a runtime error like:

    Uncaught TypeError: Cannot read properties of undefined (reading 'difference')

Try the following code.

if (this._tables && typeof this._tables.difference === 'function') {

    this._tables.difference(...); // ← provide actual arguments here

} else {

    console.error('difference method not available on _tables');

}

- this._tables && ensures _tables is not null or undefined.

- typeof ... === 'function' ensures that .difference is a callable method.

In order to help you more efficiently, would you please provide a little more information about the problem?

Hope it helps