Index: modules/filter/filter.module
===================================================================
RCS file: /cvs/drupal/drupal/modules/filter/filter.module,v
retrieving revision 1.143
diff -u -Ffunction -r1.143 filter.module
--- modules/filter/filter.module	1 Sep 2006 07:32:57 -0000	1.143
+++ modules/filter/filter.module	8 Sep 2006 20:49:27 -0000
@@ -1144,6 +1144,10 @@ function _filter_url_trim($text, $length
  * Based on: http://photomatt.net/scripts/autop
  */
 function _filter_autop($text) {
+
+  if(empty($text)) {
+    return;
+  }
   // All block level tags
   $block = '(?:table|thead|tfoot|caption|colgroup|tbody|tr|td|th|div|dl|dd|dt|ul|ol|li|pre|select|form|blockquote|address|p|h[1-6])';