title: evaluateJavaScript() with Error Domain=NSCocoaErrorDomain Code=3840 just on iPhone 5 - iOS 10.3.3
body: <p>I want ti <code>evaluateJavaScript()</code> which is a function from <code>WKWebView</code> I get the error with detail is:</p>
  
  <blockquote>
    <p>Error Domain=NSCocoaErrorDomain Code=3840 "JSON text did not start with array or object and option to allow fragments not set." UserInfo={NSDebugDescription=JSON text did not start with array or object and option to allow fragments not set.}</p>
  </blockquote>
  
  <p>Can any one met this problem? Hope to your share.Thanks!</p>