New Member Registration - Email address is not being stored in the database

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I can’t even tell you how grateful I am for you guys’ help!! I’ve updated my code with the example provided by stcroppe, but I got an error on the line that says:

console.log('Profile records returned for '+userEmail+' = 'results.items.length);

Here’s how my code looks with those changes:

import wixUsers from 'wix-users';
import wixData from 'wix-data';
import wixWindow from 'wix-window';
import wixLocation from 'wix-location';

$w.onReady(() => {
 if (wixWindow.rendering.renderCycle === 1) {
 if (wixUsers.currentUser.loggedIn) {
            $w("#register").label = "Logout";
            $w("#showdashboard").show();

        } else {
            $w("#register").label = "Login/Register";
            $w("#showdashboard").hide();

        }
    }
});

export function register_onclick(event) {
 // user is logged in
 if (wixUsers.currentUser.loggedIn) {
 // log the user out
        wixUsers.logout()
            .then(() => {
 // update buttons accordingly
                $w("#register").label = "Login";
                $w("#showdashboard").hide();

            });
    }
 // user is logged out
 else {
 let userId;
 let userEmail;

 // prompt the user to log in
wixUsers.promptLogin({ "mode": "login" })
.then((user) => {                 
    userId = user.id; 
 return user.getEmail(); 
}) 
.then((email) => {
 // check if there is an item for the user in the collection
 // PER JEROME'S SUGGESTION
    console.log('User Email Address is:'+email);
    userEmail = email;
 return wixData.query("Profile").eq("email", userEmail).find();
 }) 
 .then((results) => { 
 // if an item for the user is not found 
 // PER JEROME'S SUGGESTION
     console.log('Profile records returned for '+userEmail+' = 'results.items.length);
 if (results.items.length === 0) { 
 // create an item 
 const toInsert = { "_id": userId, "email": userEmail};
 // add the item to the collection
         wixData.insert("Profile", toInsert) 
         .catch((err) => {
             console.log(err); 
         });
     } else if (results.items.length > 1) {
 // You may want to do something else here    
         console.log('Oh no we have too many ['+results.items.length+'] Profile records for '+userEmail);
     } else {
 // In production code when you have finished debugging the page 
 // This else clause could be removed
         console.log('We have seen this user before and things are good!');
     }
 // update buttons accordingly 
     $w("#register").label = "Logout";
     $w("#showdashboard").show();
 }) 
 .catch((err) => {
     console.log(err);
 });

export function showdashboard_onclick() {
    wixLocation.to(`/Profile/My-Dashboard/${wixUsers.currentUser.id}`);