Fatal error... passed by reference... comment

Probably, this is PHP 5.3 error

Fatal error: Only variables can be passed by reference in /home/dx_/bootstrap.dx.rs/modules/comment/comment-wrapper.tpl.php on line 45

This is a simple fix, just remove & sign in line 54 in template.phpand everything seems to work just fine, here is how it should look:

/**
 * Add a "Comments" heading above comments except on forum pages.
 */
function fbg_preprocess_comment_wrapper($vars) {
  if ($vars['content'] && $vars['node']->type != 'forum') {
    $vars['content'] = '<h2 class="comments">'. t('Comments') .'</h2>'.  $vars['content'];
  }
}