34f6d17474850b7cc1869ebb99fb1575b67c6847
diff --git a/release/project_release.module b/release/project_release.module
index 01d5254..17db143 100644
--- a/release/project_release.module
+++ b/release/project_release.module
@@ -971,7 +971,7 @@ function project_release_alter_project_promote_confirm_form(&$form, &$form_state
  * Submit handler for project promote confirm form.
  */
 function project_release_project_promote_confirm_form_submit($form, &$form_state) {
-  db_query("UPDATE {project_release_projects} SET releases = %d WHERE nid = %d", $form_state['values']['releases'], $form_state['values']['nid']);
+  db_query("UPDATE {project_release_projects} SET releases = %d WHERE nid = %d", (!empty($form_state['values']['releases']) ? $form_state['values']['releases'] : 0), $form_state['values']['nid']);
   unset($_SESSION['project_promote_project_releases']);
 }