Index: captcha.admin.inc
===================================================================
--- captcha.admin.inc	(revision 51)
+++ captcha.admin.inc	(working copy)
@@ -142,14 +142,16 @@
  */
 function captcha_admin_settings_submit($form, &$form_state) {
   variable_set('captcha_administration_mode', $form_state['values']['captcha_administration_mode']);
-  foreach ($form_state['values']['captcha_types'] as $captcha_point_form_id => $data) {
-    if ($data['captcha_type'] == 'none') {
-      db_query("UPDATE {captcha_points} SET module = NULL, type = NULL WHERE form_id = '%s'", $captcha_point_form_id);
+  if (is_array($form_state['values']['captcha_types']) && !empty($form_state['values']['captcha_types'])) {
+    foreach ($form_state['values']['captcha_types'] as $captcha_point_form_id => $data) {
+      if ($data['captcha_type'] == 'none') {
+        db_query("UPDATE {captcha_points} SET module = NULL, type = NULL WHERE form_id = '%s'", $captcha_point_form_id);
+      }
+      else {
+        list($module, $type) = explode('/', $data['captcha_type']);
+        db_query("UPDATE {captcha_points} SET module = '%s', type = '%s' WHERE form_id = '%s'", $module, $type, $captcha_point_form_id);
+      }
     }
-    else {
-      list($module, $type) = explode('/', $data['captcha_type']);
-      db_query("UPDATE {captcha_points} SET module = '%s', type = '%s' WHERE form_id = '%s'", $module, $type, $captcha_point_form_id);
-    }
   }
   // description stuff
   if (module_exists('locale')) {