Update asyncMonitor.js

Author: wupenghe92

asyncMonitor.js

@@ -88,7 +88,7 @@ function asyncMonitor(portNumber) {
  }
  }
 
- if(resource.args && resource.args[0].constructor.name === 'Socket'){
+ if(resource.args && resource.args[0] && resource.args[0].constructor.name === 'Socket'){
  if(resource.args[0].server && resource.args[0].server._connectionKey === `6::::${portNumber}`){
  deleteEntireBranch(triggerAsyncId);
  return;