system.module + warning: Illegal offset type line 885

Happy New Years everyone. I'm new to Drupal, and I think it absolutely rocks.

I'm running Drupal 6.15 for a client, and getting the following error:

warning: Illegal offset type in /home/client/web_root/drupal/modules/system/system.module on line 885.

Here's line 885. I'm using the Zeropoint Theme. Any thoughts on what's causing this error and how to resolve it?

      // Give the scripts proper path information.
      $scripts = array();
      foreach ($themes[$key]->info['scripts'] as $script) {

        //This is line 885
        $scripts[$script] = dirname($themes[$key]->filename) .'/'. $script;

      }
      $themes[$key]->info['scripts'] = $scripts;
      // Give the screenshot proper path information.
      if (!empty($themes[$key]->info['screenshot'])) {
        $themes[$key]->info['screenshot'] = dirname($themes[$key]->filename) .'/'. $themes[$key]->info['screenshot'];
      }
    }