title: org.openqa.selenium.WebDriverException: '[JavaScript Error: "a is null
body: <p>I have a 2 situations to execute the javascript functionality:</p>
  
  <p>Case 1 - to get the XXXXX information from iframe using executeScript() and save it in global variable 
  --> Refresh the iframe.</p>
  
  <p>Case 2 - using that XXXXX information again I need to use executeScript().</p>
  
  <p>Here I can get the result for Case 1. But when case 2 is executed then it HANGS.. any idea?</p>
  
  <p>Thanks &amp; Regards
  Ramesh Kumar</p>