"Cannot read property 'member' of null"

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Hello, I’ve managed to register/create multiple members and sending them emails with their password with this code on the frontend:

import wixUsers from 'wix-users';
import wixData from 'wix-data';
import { backendmail } from 'backend/Emails';

export function button1_click(event) {
 return wixData.query("UsuariosCSV")
        .limit(1000)
        .find()
        .then((result) => {
         let items = result.items;
         for (var i = 0; i < items.length; i++) {
         if (items[i] === null) continue;
         //console.log(i);
         let pass = items[i].pass;
         let nombre = items[i].nombre;
         let email = items[i].email;
                wixUsers.register(email, pass);
                 //console.log('member created');
                wixData.query("Members/PrivateMembersData")
                    .eq("loginEmail", email)
                    .find()
                    .then((results) => {
                     let idResults = []
                        results.items.forEach(function (element) {
                            idResults.push(element._id);
                        })
 //console.log(idResults[0]);
 //console.log(pass);
 //console.log(nombre);
                        backendmail(idResults[0], pass, nombre);
                    });
            }

        });
}

And this little module on the backend:

import wixUsersBackend from 'wix-users-backend';

export function backendmail(user_id,pass,name) {
 return wixUsersBackend.emailUser('TestPass', user_id, {
            variables: {
                passw: pass,
                Nombrew: name
            }
        })
        .then(() => {
            console.log("email sent")
        })
        .catch((err) => {
            console.log("not sent")
        })
}

But I’m receiving this error: “Cannot read property ‘member’ of null”. And is not sending 1 of the emails on the list; can anyone help me spot the issue?