Recoverable fatal error in bootstrap.inc

I'm using D6.3 actually. Site Documentation version is 6.x-1.1 (obviously), and I was running it configured with quite a few boxes checked but none of the deleting or releasing operations. Installed modules include CCK, Views 2, imagecache, imageapi, token, jQuery, etc. Here is my sitedoc list summary, and the error message i got in dsm():

* Operating in off-line mode.
* Default format updated.
* 85 tables found in database.
* 7 content types found.
* 61 modules found.
* 12 Theme found.
* 151 system variables found.
* 136 Blocks found.
* 7 Roles found.
* 2 Contacts found.
* 4 Profile fields found.
* 1 URL Aliases found.1 nodes without aliases found.

# recoverable fatal error: Object of class stdClass could not be converted to string in /home/content/s/c/o/apache/html/my drupal website/includes/bootstrap.inc on line 720.
# warning: preg_match() expects parameter 2 to be string, object given in /home/content/s/c/o/apache/html/my drupal website/includes/bootstrap.inc on line 723

So the offending function looks pretty simple, notwithstanding my regular expressions experience:

719: function drupal_validate_utf8($text) {
720:   if (strlen($text) == 0) {
721:     return TRUE;
722:   }
723:   return (preg_match('/^./us', $text) == 1);
724: }

I can provide more information about my config. Just let me know or post here on what you thinks up. It's not even a big deal since it fixes itself basically, but probably worth noting?