html - Navbar Toggle Button Stops Working -

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the navbar toggle button works first 3 tabs (index.php, albums.php , photos.php). button stops working once click on videos.php tab. doesn't work tab later videos.php.

note: works first 3 tabs in case. stops working fourth tab , onwards. seems problem?

 <div class = "navbar-header">     <button type = "button" class = "navbar-toggle collapsed" data-toggle = "collapse" data-target = "#main_navbar" aria-expanded = "false" aria-controls = "navbar">         <span class = "icon-bar"></span>         <span class = "icon-bar"></span>         <span class = "icon-bar"></span>     </button> </div> <!--navbar collapsed -->  <!-- start of  un-collapsed navbar --> <div class = "collapse navbar-collapse" id = "main_navbar">     <ul class =  "nav navbar-nav">           <li><a href="index.php">home</a></li>          <li><a href="albums.php">albums</a></li>          <li><a href="photos.php">photos</a></li>          <li><a href="videos.php">videos</a></li>          <li class = "dropdown"> <!-- dropdown menu -->          <a href = "#" class = "dropdown-toggle" data-toggle = "dropdown">menu <span class = "caret"></span></a>             <ul class = "dropdown-menu">                 <li><a href = "category.php">hum tv</a></li>                 <li><a href = "#">geo tv</a></li>                 <li><a href = "#">ptv home</a></li>             </ul>          </li><!-- /dropdown menu -->     </ul> </div>


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