Index: ddllib.php
===================================================================
RCS file: /cvsroot/moodle/moodle/lib/ddllib.php,v
retrieving revision 1.59.2.3
diff -u -r1.59.2.3 ddllib.php
--- ddllib.php	26 Feb 2008 10:32:41 -0000	1.59.2.3
+++ ddllib.php	22 Nov 2008 17:37:06 -0000
@@ -1050,7 +1050,7 @@
     if ($field->getNotNull() && $generator->getDefaultValue($field) === NULL && count_records($table->getName())) {
         debugging('Field ' . $table->getName() . '->' . $field->getName() .
                   ' cannot be added. Not null fields added to non empty tables require default value. Create skipped', DEBUG_DEVELOPER);
-         return true;
+         return false;
     }
 
     if(!$sqlarr = $table->getAddFieldSQL($CFG->dbtype, $CFG->prefix, $field, false)) {