Add an error message if [object Object] appears?

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The call to getCurrentItem() should be inside of a dataset.onReady() event handler to ensure that the dataset is ready before trying to access it. Otherwise nothing will be returned and item will be undefined . You should have something like this:

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

Or you could just put it inside of the onMessage() function:

$w("#c1").onMessage((event) => {
  let item = $w('#zipcodeset').getCurrentItem();
  if (wixWindow.formFactor === "Mobile") {
    $w("#c1").postMessage(item.chart1Mobile);
  } else {
    $w("#c1").postMessage(item.chart1);
  }
}

BTW - I think your code is missing a closing bracket for the onMessage function.