UI prints error messages twice about helmet-ui HOT 3 CLOSED

// Relay a loggable event in worker; worker => main => UI
ipcMain.on('loggable-event-from-worker', (event, args) => {
  event_time = args["time"];
  delete(args["time"]);
  // python-shell 3.0.0 breaking change: Every character from
  // stderr is its own value (like {0: 'h', 1: 'e', 2: 'l', 3: 'l', 4: 'o'})
  // so let us join all values into one string ('hello').
  event_string = Object.values(args).join('');
  // Try to read the string as JSON. If it fails, use the whole string
  // as a message. Messages via utils.log are written to stderr as JSON.
  // Warnings from numpy tend to be written as plain-text. 
  try {
    // utils.log
    event_args = JSON.parse(event_string);
    //console.log('Normal event')
  } catch (error) {
    // numpy warnings and other non-log messages
    //return;
    event_args = {
      "level": "EXCEPTION",
      "message": event_string,
    };
    //console.log('Exception event')
  }
  event_args["time"] = event_time;

  mainWindow.webContents.send('loggable-event', event_args);
});

// Log worker-errors (by PythonShell, not stderr) in main console
ipcMain.on('process-error-from-worker', (event, args) => {
  mainWindow.webContents.send('loggable-event', {
    "level": "ERROR",
    "message": (typeof args === "string") ? args : JSON.stringify(args)
  });
});