Add an error message if [object Object] appears?

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Thank you so much for your reply! I’m still getting the error (only on Chrome for mobile) – this is the way my code looks now, in case I did something else wrong and you want to take a look (it’s the whole code this time, in case that helps at all – I adjusted the brackets, etc. until the red warning squiggles disappeared):

import wixWindow from 'wix-window';

$w.onReady(function () {

$w("#zipcodeset").onReady( () => {
   let item = $w('#zipcodeset').getCurrentItem();

$w("#c1").onMessage((event) => {
     if(wixWindow.formFactor === "Mobile") { 
    $w("#c1").postMessage(item.chart1Mobile);
     } else {
         $w("#c1").postMessage(item.chart1); }
});
$w("#c2").onMessage((event) => {
     if(wixWindow.formFactor === "Mobile") { 
    $w("#c2").postMessage(item.chart2Mobile);
     } else {
         $w("#c2").postMessage(item.chart2); }
});
$w("#c3").onMessage((event) => {
     if(wixWindow.formFactor === "Mobile") { 
    $w("#c3").postMessage(item.chart3Mobile);
     } else {
         $w("#c3").postMessage(item.chart3); }
});
$w("#c4").onMessage((event) => {
     if(wixWindow.formFactor === "Mobile") { 
    $w("#c4").postMessage(item.chart4Mobile);
     } else {
         $w("#c4").postMessage(item.chart4); }
});
$w("#c5").onMessage((event) => {
     if(wixWindow.formFactor === "Mobile") { 
    $w("#c5").postMessage(item.chart5Mobile);
     } else {
         $w("#c5").postMessage(item.chart5); }
});
$w("#c6").onMessage((event) => {
     if(wixWindow.formFactor === "Mobile") { 
    $w("#c6").postMessage(item.chart6Mobile);
     } else {
         $w("#c6").postMessage(item.chart6); }
});
$w("#c7").onMessage((event) => {
     if(wixWindow.formFactor === "Mobile") { 
    $w("#c7").postMessage(item.chart7Mobile);
     } else {
         $w("#c7").postMessage(item.chart7); }
});
});

$w('#howToButton').onClick(() => {
    toggleBox($w('#howToStripCollapse'), $w('#plus'), $w('#minus'));
});


function toggleBox(howToStripCollapse, plus, minus) {
    const isCollapsed = howToStripCollapse.collapsed;
    if (isCollapsed) {
        plus.hide();
        minus.show();
        howToStripCollapse.expand();
    } else {
        minus.hide();
        plus.show();
        howToStripCollapse.collapse();
    }
}})

Or if you don’t see anything obvious (or if my code’s just too laughably amateurish and it’s obvious I’m in way over my head here), is there a way to get an error message to the user when the page doesn’t load as intended?