Index: modules/aggregator/aggregator.processor.inc
===================================================================
--- modules/aggregator/aggregator.processor.inc	(revision 2)
+++ modules/aggregator/aggregator.processor.inc	(working copy)
@@ -138,6 +138,9 @@
  */
 function aggregator_save_item($edit) {
   if ($edit['title'] && empty($edit['iid'])) {
+    if (strlen($edit['title']) > 255) {
+      $edit['title'] = substr($edit['title'], 0, 255);
+    }
     $edit['iid'] = db_insert('aggregator_item')
       ->fields(array(
         'title' => $edit['title'],