I wrote a function in an article override to search a folder for images and create a pagebreak behavior per image in an article. All works fine except for a 404 error being returned for each pagination link.

I determined that the error is caused by Joomla's pagebreak content plugin pagebreak.php where the condition is:

if (StringHelper::strpos($row->text, 'class="system-pagebreak') === false)
    {
        if ($page > 0)
        {
            throw new Exception(JText::_('JERROR_PAGE_NOT_FOUND'), 404);
        }

        return true;
    }

If I comment out the line throw new Exception(JText::_('JERROR_PAGE_NOT_FOUND'), 404); or disable the plugin the process works perfectly. However, being that the file is subject to overwriting on updates, that is not an ideal option.

My code is:

$pagebreak='';
if(preg_match('#\{pagebreakgallery=\"(.*?)\"\}#i', $item->text, $folder)) 
{
    $imagesDir = JPATH_ROOT.'/images/photogallery/'.$folder[1].'/';
    $images = str_replace(JPATH_ROOT, Juri::root(true), glob($imagesDir . '*.{jpg,jpeg,png,gif}', GLOB_BRACE));

    foreach($images as $image) {
      $page_break[] = '<img src="'.$image.'" />';
    }
    $item->text = str_replace($folder[0], '', $item->text);

    $pagenum = 0;
    if($app->input->get('start') != '')
        $pagenum = $app->input->getInt('start');

    $pages = count($page_break);
    if($pages > 0)
    {
        $pagelinks = new JPagination($pages, $pagenum, 1);
        $pagebreak .= $page_break[$pagenum];
        $pagebreak .= '
            <div class="paging">
                <div class="pagecount">' . $pagelinks->getPagesCounter() . '</div>
                <div class="pager">' . $pagelinks->getPagesLinks() . '</div>
            </div>
        ';
    }
}

How can I resolve this error occurrence?