title: Difficulties in integrating "tui-editor-1.0.3"
body: <p>I am facing difficulties in integrating "<a href="https://github.com/nhnent/tui.editor" rel="nofollow noreferrer">tui-editor-1.0.3</a>" in a webpage.<br></p>
  
  <p>It throws an error : <code>"Uncaught TypeError: Cannot read property 'scrollIntoView' of undefined"</code> 
  The source of error was at line number <code>19122</code> of <code>tui-Editor-editor.js</code>, where exist  <code>null</code> value in <code>this._currentButton</code> and it tries to access <code>this._currentButton.scrollIntoView()</code>.<br></p>
  
  <p>I tried to check for <code>null</code> values before accessing <code>this._currentButton.scrollIntoView</code>, but it does not produce appropriate view of editor.
  <br></p>
  
  <p>How to make sure that <code>this._currentButton</code> is always not null-able? Or, any other solution ?</p>