node.js crashing after loop iteration

I'm trying to write a performance tool using node.js so I can automate it, and store the results in MySQL. The tool is supposed to gather how long took for the browser to load a particular webpage. I'm using HttpWatch to measure the performance, and the result is displayed in seconds. The browser utilized is Firefox. Below is a piece of script I'm using to run the performance test:

var MyUrls = [
    "http://google.com",
    "http://yahoo.com"
    ];    

try {

       var win32ole = require('win32ole');
       var control = win32ole.client.Dispatch('HttpWatch.Controller');
       var plugin = control.Firefox.New();
       for (var i=0; i < MyUrls.length; i++) {
          var url = MyUrls[i];
          console.log(url);
          for(var j=0; j < 14; j++) {
            // Start Recording HTTP traffic
            plugin.Log.EnableFilter(false);
            // Clear Cache and cookier before each test
            plugin.ClearCache();
            plugin.ClearAllCookies();   
            plugin.ClearSessionCookies();
            plugin.Record();
            // Goto to the URL and wait for the page to be loaded
            plugin.GotoURL(url);
            control.Wait(plugin, -1);
            // Stop recording HTTP
            plugin.Stop();
            if ( plugin.Log.Pages.Count != 0 )
            {           
               // Display summary statistics for page
               var summary = plugin.Log.Pages(0).Entries.Summary;
               console.log(summary.Time);
            }
          }
       }
       plugin.CloseBrowser();
    } catch(e) {
        console.log('*** exception cached ***\n' + e);
    }

After the second iteration of the inner loop, I'm getting the following error:

C:\xampp\htdocs\test\browser-perf>node FF-load-navigation.js
http://localhost/NFC-performance/Bing.htm
[Number (VT_R8 or VT_I8 bug?)]
2.718
[Number (VT_R8 or VT_I8 bug?)]
2.718
OLE error: [EnableFilter] -2147352570 [EnableFilter] IDispatch::GetIDsOfNames Au
toWrap() failed

Have someone seen this before? Can you help me?

You have to remember that node is asynchronous

So that for loop runs simultaneously to plugin.CloseBrowser();, which is obviously not what you want because thats causing it to close, which will cause problems in the for loop.

rather you want that to run after the for loop finishes.

Look at async for a simple way to do this.

async.each(MyUrls, function (callback) {
    ...
    callback()
}, function(err){
    plugin.CloseBrowser();
});

The same has to be done for your inner for loop.