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console.log(this._tables);

if (this._tables.difference) {

    this._tables.difference(...);

} else {

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

}


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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

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