message: Check that source is not null before calling the screen frame application
diff: @@ -576,6 +576,7 @@ export class WindowHandler {
  this.addWindow(opts.winKey, this.screenPickerWindow);
  });
  ipcMain.once('screen-source-selected', (_event, source) => {
  + if (source != null) {
  if (isWindowsOS) {
  logger.info(`window-handler: screen-source-selected`, source, id);
  const type = source.id.split(':')[0];
  @@ -584,6 +585,7 @@ export class WindowHandler {
  this.execCmd(this.screenShareIndicatorFrameUtil, [ hwnd ]);
  }
  }
  + }
  window.send('start-share' + id, source);
  if (this.screenPickerWindow && windowExists(this.screenPickerWindow)) {
  