Write a warning instead of crashing.

spec/api-ipc-spec.js

@@ -495,7 +495,7 @@ describe('ipc module', function () {
       assert.equal(w.listenerCount('test'), 0)
     })
 
-    it('throws an error when a function is called in a destroyed renderer', (done) => {
+    it('shows a warning when a function is called in a destroyed renderer', (done) => {
       w = new BrowserWindow({
         show: false
       })
@@ -506,8 +506,8 @@ describe('ipc module', function () {
             'Function provided here: remote-event-handler.html:11:33',
             'Remote event names: remote-handler, other-remote-handler'
           ].join('\n')
-          const errorMessage = ipcRenderer.sendSync('try-emit-web-contents-event', w.webContents.id, 'remote-handler')
-          assert.equal(errorMessage, expectedMessage)
+          const warningMessage = ipcRenderer.sendSync('try-emit-web-contents-event', w.webContents.id, 'remote-handler')
+          assert.equal(warningMessage, expectedMessage)
           done()
         })
         w.webContents.reload()

spec/static/main.js

@@ -251,11 +251,13 @@ ipcMain.on('prevent-next-new-window', (event, id) => {
 })
 
 ipcMain.on('try-emit-web-contents-event', (event, id, eventName) => {
-  const contents = webContents.fromId(id)
-  try {
-    contents.emit(eventName, {sender: contents})
-    event.returnValue = null
-  } catch (error) {
-    event.returnValue = error.message
+  const consoleWarn = console.warn
+  let lastWarning = null
+  console.warn = (message) => {
+    lastWarning = message
   }
+  const contents = webContents.fromId(id)
+  contents.emit(eventName, {sender: contents})
+  event.returnValue = lastWarning
+  console.warn = consoleWarn
 })