mysql throws error in console and stopping nodejs server

Question

I am trying to handle the error of mysql query for deleting.

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When the error is occurring, instead of executing the response function MySQL is throwing the error in the console and stopping the server.

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This used to work before, but now it is not working now.

Is this because of any version of MySQL and nodejs??

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I am using node js version: v10.6.0.

MySQL connector version: ^2.16.0.

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I have created a relationship between two tables with restricting delete.

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This is my code to delete an item from the table.

this.deletePurchaseBill = function (id) {
    return new Promise(function (resolve, reject) {
        var delete_purchase_bill_sql = `DELETE FROM purchase_entry_header WHERE id = '${id}'`;
        conn.query(delete_purchase_bill_sql, function (err, result) {
            console.log('error:' + err);
            if (err) {
                if (err.errno == 1451) {
                    resolve({
                        status: "error",
                        message: "This purchase can not be deleted",
                        debug: err,
                    });
                } else {
                    resolve({
                        status: "error",
                        message: "Unexpected error occurred",
                        debug: err
                    });
                }
            } else {
                resolve({
                    status: "success",
                    message: "Successfully Deleted"
                });
            }
        });
    });
};

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Any help would be appriceated