finding URL by AutomationElement not working

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C#5.0

chrome

automation

Hi,

My application find the currently open URL from chrome when user press "enter" key.
But actually when I press the "enter" key sometime application is crashed and all time it doesn't give me a opened URL.

And most stressful problem is application works good if I set debug point before or at this

AutomationElement elm = AutomationElement.FromHandle(new IntPtr(handle));

line.

If trying without debug point its not working.

And yes main thing is that there is no any exception.

here I attach the full code of my method which return the URL of chrome opened tab.

private string GetCurrentChromeUrl()
{
        try
        {
            string url = null;
            int handle = GetForegroundWindow();
            foreach (Process P in Process.GetProcessesByName("chrome"))
            {
                if(P.MainWindowHandle.ToInt32() > 0)
                {
                    handle = P.MainWindowHandle.ToInt32();
                    break;
                 }
             }
             AutomationElement elm = AutomationElement.FromHandle(new IntPtr(handle));
             AutomationElement elmUrlBar = elm.FindFirst(TreeScope.Descendants,
             new PropertyCondition(AutomationElement.NameProperty, "Address and search bar"));
             if (elmUrlBar != null)
             {
                    AutomationPattern[] patterns = elmUrlBar.GetSupportedPatterns();
                    if (patterns.Length > 0)
                    {
                        ValuePattern val = (ValuePattern)elmUrlBar.GetCurrentPattern(patterns[0]);
                        url = val.Current.Value;
                        //break;
                    }
              }
          return url;
          }
          catch (Exception e1)
          {
                return "";
          }

}

I'm very upset by facing this error since two days.

Please help me to solve this problem.