After Looking at line 1899 at my version i see no problem its Most likely to be a hack or an improperly uploaded file. To fix this, remove any hacks and disable your plugins, then see if you still have this problem.
To temporarily disable the plugin system, edit in your includes folder config.php and add this line at the bottom of the script <?php
define('DISABLE_HOOKS', true);
If it works then reupload all the original vB non-image files. Make sure you upload these in ASCII format and overwrite the ones on the server. This should work if not i tried
Enjoy