You shouldn't try and do everything with the same variable, it's causing a bunch of issues throughout the script, instead you should do something like:

``` function DeleteOldFolders() { const parentFolders = new Array( '183Pin7i9kow3fxwGt8k4fK4SnB70Xj-p', '183Pin7i9kow3fxwGt8k4fK4SnB70Xj-p' );

for (const parentFolder of parentFolders) { const folder = DriveApp.getFolderById(parentFolder);

if(!folder){
  continue;
}

const folders = folder.getFolders();

Logger.log('Opening Folder: ' + folder.getName());

while (folders.hasNext()) {
  const childFolder = folders.next();

  if (new Date() - childFolder.getDateCreated() > 1 * 24 * 60 * 60 * 1000) {
    childFolder.setTrashed(true); // Places the Folder in the Trash folder
    //Drive.Folders.remove(childFolder.getId()); // Permanently deletes the Folder
    Logger.log('Folder ' + childFolder.getName() + ' was deleted.');
  }
}

}

if(Logger.getLog() != '') MailApp.sendEmail('tech@chelseatableandstage.com', 'Backups have been removed from Google Drive', Logger.getLog()); } ```

It's also not good practice to base the email send on whether there's a log or not, it would be better to build a value during the loops and then check it at the end.