fix(#28): uncaught exception on macOS when app was closed and reopened

src/main/index.ts

@@ -7,6 +7,7 @@ import {
   registerGrpcWebClientSubscribers,
   registerOSSubscribers,
   registerProtobufSubscribers,
+  unregisterDialogSubscribers,
 } from './ipc';
 
 // This allows TypeScript to pick up the magic constant that's auto-generated by Forge's Webpack
@@ -60,6 +61,8 @@ app.on('ready', createWindow);
 // for applications and their menu bar to stay active until the user quits
 // explicitly with Cmd + Q.
 app.on('window-all-closed', () => {
+  unregisterDialogSubscribers();
+
   if (process.platform !== 'darwin') {
     app.quit();
   }

src/main/ipc/dialog/subscribers.ts

@@ -13,3 +13,7 @@ export const registerDialogSubscribers = (mainWindow: BrowserWindow) => {
     return [];
   });
 };
+
+export const unregisterDialogSubscribers = () => {
+  ipcMain.removeHandler(DialogChannel.OPEN);
+};