Recently I got to fix some older Drupal 6 site. It had WSOD so I needed to add this to index http://drupaldump.com/wsod-or-white-screen-death-and-error-reporting and then I saw sort of this error "Fatal error: Unsupported operand types in common.inc" so I used this post https://www.drupal.org/node/362799 and added this code to the "l" function, and solved this bugger.
if (!is_array($options)) {
echo "";
$backtrace = debug_backtrace();
var_export($backtrace[0]);
die();
}