Error: Object has been destroyed when sending message from Main to Renderer

Description

I am trying to send a message from Main to the Renderer and whenever I do, I get "Error: Object has been destroyed"

I can't figure out if I'm doing something incorrectly or if this is not possible with menubar.

I have successfully gotten messages to send to the menubar renderer when it is already open using the event reply method:

ipcMain.on('testFromRenderer', (event) => {
  event.reply('responseFromMain', 'responseContent')
})

However, I get an error when I try to trigger an event that isn't a direct response to an event from the Renderer

mb.window.send('triggerFromMain')
mb.window.webContents.send('triggerFromMain')

const mb = menubar({
  browserWindow: { webPreferences: { nodeIntegration: true } },
  dir: APP_PATH,
  icon: path.resolve(APP_PATH, './icon.png'),
  preloadWindow: true,
  showDockIcon: false,
  showOnAllWorkspaces: true,
  tooltip: 'Runner',
})

I create the menubar in one file and am trying to send this message from a very different part of the codebase. I have tried importing it, and also tried attaching mb to global. Not sure how to best approach this.

Steps to Reproduce the Problem

1. Create a new menubar
2. Attempt to send a message from Main

Expected Behaviour

Should be able to send a message

Actual Behaviour

Error: Object has been destroyed

Specifications

• Menubar version: 7.2.0
• Platform: OSX Catalina 10.15.1
• Electron version: 7.1.10 (Run electron -v or node_modules/.bin/electron -v to get it)

Start with the menubar creation shown in the issue and trace the ipcMain, mb.window.send, and mb.window.webContents.send calls. Reproduce the error using the stated menubar 7.2.0 and Electron 7.1.10 versions, then verify that a main-process message can be sent when the renderer is open without producing "Object has been destroyed".