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Index: moodle/lib/db/upgrade.php
--- moodle/lib/db/upgrade.php Base (1.423)
+++ moodle/lib/db/upgrade.php Locally Modified (Based On 1.423)
@@ -4356,6 +4356,7 @@
 
         // enabled
         $processed = $DB->get_fieldset_sql("SELECT DISTINCT enrol FROM {enrol}");
+        if (!empty($processed)) {
         $enabledplugins = explode(',', $CFG->enrol_plugins_enabled);
         list($sqlnotprocessed, $params) = $DB->get_in_or_equal($processed, SQL_PARAMS_NAMED, 'np00', false);
         list($sqlenabled, $params2) = $DB->get_in_or_equal($enabledplugins, SQL_PARAMS_NAMED, 'ena00');
@@ -4385,6 +4386,7 @@
                   JOIN {role_assignments} ra ON (ra.contextid = ctx.id)
                  WHERE c.id <> :siteid AND ra.enrol $sqlnotprocessed";
         $DB->execute($sql, $params);
+        }
 
         upgrade_main_savepoint($result, 2010061900.08);
     }