diff --git sites/default/modules/ajax/ajax.module sites/default/modules/ajax/ajax.module
index cdf891c..fe3235e 100644
--- sites/default/modules/ajax/ajax.module
+++ sites/default/modules/ajax/ajax.module
@@ -200,6 +200,7 @@ function ajax_is_submitter($form, $form_key) {
   if (array_key_exists('#type', $form[$form_key])) {
     if (
       $form[$form_key]['#type'] === 'submit' ||
+      $form[$form_key]['#type'] === 'image_button' ||
       $form[$form_key]['#type'] === 'button'
     ) {
       if ($form_key === 'submit' || $form_key === 'preview') {