diff --git a/mod/feedback/db/upgrade.php b/mod/feedback/db/upgrade.php
index ba7e0e84def..e46d9c8b770 100644
--- a/mod/feedback/db/upgrade.php
+++ b/mod/feedback/db/upgrade.php
@@ -270,8 +270,10 @@ function xmldb_feedback_upgrade($oldversion) {
         $table = new xmldb_table('feedback');
         $field = new xmldb_field('introformat', XMLDB_TYPE_INTEGER, '2', XMLDB_UNSIGNED, XMLDB_NOTNULL, null, null, null, '0', 'intro');
 
-    /// Launch add field introformat
-        $dbman->add_field($table, $field);
+    /// Conditionally launch add field introformat
+        if (!$dbman->field_exists($table, $field)) {
+            $dbman->add_field($table, $field);
+        }
 
     /// feedback savepoint reached
         upgrade_mod_savepoint($result, 2009042001, 'feedback');