No IPC events being shown; IPC chrome tools crashing

[appjitsu]

"electron": "^2.0.3",

console errors:

[5968:0626/095527.874:ERROR:CONSOLE(4799)] "Cannot find context with specified id", source: chrome-devtools://devtoo
undled/inspector.js (4799)
[5968:0626/095527.874:ERROR:CONSOLE(7574)] "Extension server error: Inspector protocol error: Cannot find context wi
pecified id", source: chrome-devtools://devtools/bundled/inspector.js (7574)
[5968:0626/095527.878:ERROR:CONSOLE(1076)] "Getting IPC events failed", source: chrome-extension://devtron/out/index
(1076)
[5968:0626/095527.878:ERROR:CONSOLE(1077)] "[object Object]", source: chrome-extension://devtron/out/index.js (1077)

// public/electron.js

const { app, BrowserWindow, ipcMain } = require('electron');
const isDev = require('electron-is-dev');

function createWindow() {
  mainWindow = new BrowserWindow({width: 900, height: 680});
  mainWindow.loadURL(isDev ? 'http://localhost:3000' : `file://${path.join(__dirname, '../build/index.html')}`);
  mainWindow.on('closed', () => mainWindow = null);

  if (isDev) {
    // dev tools
    require('devtron').install(); // load devtron
    mainWindow.webContents.openDevTools(); // load chrome dev tools
  }
}

...

let onlineStatus;

// track online/offline status
ipcMain.on('online-status-changed', (event, status) => {
  console.log(status);
  onlineStatus = status;
});

// public/online.js <- loaded via script tag in index.html

const { ipcRenderer } = require('electron');
let onlineStatus = navigator.onLine;

const updateOnlineStatus = () => {
  onlineStatus = navigator.onLine ? 'online' : 'offline';
  ipcRenderer.send('online-status-changed', onlineStatus);
}

window.addEventListener('online',  updateOnlineStatus);
window.addEventListener('offline',  updateOnlineStatus);

updateOnlineStatus();

I can see the console messages being sent back and forth between processes.