diff --git a/multiple_select.module b/multiple_select.module
index 7226c4e..c9a1c9b 100644
--- a/multiple_select.module
+++ b/multiple_select.module
@@ -30,9 +30,9 @@ function multiple_select_form_taxonomy_term_form_alter(&$form, $form_state, $for
 }
 
 /**
- * Implements site_setting_entity_form_alter().
+ * Implements hook_form_alter().
  */
-function multiple_select_form_site_setting_entity_form_alter(&$form, $form_state, $form_id) {
+function multiple_select_form_alter(&$form, $form_state, $form_id) {
   $form = multiple_select($form, $form_state, $form_id);
 }
 
@@ -40,50 +40,55 @@ function multiple_select_form_site_setting_entity_form_alter(&$form, $form_state
  * Custom callback().
  */
 function multiple_select(&$form, $form_state, $form_id) {
-  $shared_bulk_config = multiple_select_get_bulk_configs();
-  if (is_null($shared_bulk_config)) {
-    return $form;
-  }
+  if ($form_state->getFormObject() instanceof \Drupal\Core\Entity\EntityFormInterface) {
+    $shared_bulk_config = multiple_select_get_bulk_configs();
+    if (is_null($shared_bulk_config)) {
+      return $form;
+    }
 
-  $is_original_language = TRUE;
-  if (!strContains($form_id, 'taxonomy_term')) {
-    $is_original_language = $form_state->getFormObject()->getEntity()->get('default_langcode')->value;
-  }
-  $entities = array_keys($shared_bulk_config);
-  foreach ($entities as $type) {
-
-    if (strpos($form_id, $type) !== FALSE) {
-      foreach (array_keys($form) as $item) {
-        if (is_array($form[$item]) && isset($form[$item]['widget']['#type'])
-          && in_array($form[$item]['widget']['#field_name'], $shared_bulk_config[$type])
-          && $form[$item]['widget']['#type'] == 'checkboxes'
-          && !(!$is_original_language && !$form_state->getFormObject()->getEntity()
-            ->get($form[$item]['widget']['#field_name'])
-            ->getFieldDefinition()->isTranslatable())) {
-
-          $name = str_replace('_', '-', $item);
-          $form['#attached']['library'][] = 'multiple_select/selectall';
-
-          $form['checkall' . $name] = [
-            '#type' => 'checkbox',
-            '#title' => t('Select All / Uncheck All'),
-            '#weight' => isset($form[$item]['#weight']) ?
-            $form[$item]['#weight'] - 1 : 0,
-            '#required' => FALSE,
-            '#attributes' => ['id' => "multiple_select-$item"],
-          ];
-
-          if (\Drupal::moduleHandler()->moduleExists('field_group')
-          && !empty($form['#group_children'][$item])) {
-            $group = $form['#group_children'][$item];
-            $field_name = 'checkall' . $name;
-            $form['#group_children'][$field_name] = $group;
-            $form[$group][$field_name] = $form[$field_name];
-            unset($form[$field_name]);
+    $is_original_language = TRUE;
+    if (!strContains($form_id, 'taxonomy_term')) {
+      if($form_state->getFormObject()->getEntity()->get('default_langcode')) {
+        $is_original_language = $form_state->getFormObject()->getEntity()->get('default_langcode')->value;
+      }
+    }
+    $entities = array_keys($shared_bulk_config);
+    foreach ($entities as $type) {
+
+      if (strpos($form_id, $type) !== FALSE) {
+        foreach (array_keys($form) as $item) {
+          if (is_array($form[$item]) && isset($form[$item]['widget']['#type'])
+            && in_array($form[$item]['widget']['#field_name'], $shared_bulk_config[$type])
+            && $form[$item]['widget']['#type'] == 'checkboxes'
+            && !(!$is_original_language && !$form_state->getFormObject()->getEntity()
+              ->get($form[$item]['widget']['#field_name'])
+              ->getFieldDefinition()->isTranslatable())) {
+
+            $name = str_replace('_', '-', $item);
+            $form['#attached']['library'][] = 'multiple_select/selectall';
+
+            $form['checkall' . $name] = [
+              '#type' => 'checkbox',
+              '#title' => t('Select All / Uncheck All'),
+              '#weight' => isset($form[$item]['#weight']) ?
+              $form[$item]['#weight'] - 1 : 0,
+              '#required' => FALSE,
+              '#attributes' => ['id' => "multiple_select-$item"],
+            ];
+
+            if (\Drupal::moduleHandler()->moduleExists('field_group')
+            && !empty($form['#group_children'][$item])) {
+              $group = $form['#group_children'][$item];
+              $field_name = 'checkall' . $name;
+              $form['#group_children'][$field_name] = $group;
+              $form[$field_name]['#weight'] = $form[$field_name]['#weight'] + 1;
+              $form[$group][$field_name] = $form[$field_name];
+              unset($form[$field_name]);
+            }
           }
         }
-      }
 
+      }
     }
   }
 
@@ -141,3 +146,18 @@ a configuration page in which this functionality can be applied to one (or more)
       return $output;
   }
 }
+
+
+/**
+ * Implements hook_module_implements_alter().
+ */
+function multiple_select_module_implements_alter(&$implementations, $hook) {
+  switch ($hook) {
+    // Move our hook_form_alter() implementation to the end of the list.
+    case 'form_alter':
+      $group = $implementations['multiple_select'];
+      unset($implementations['multiple_select']);
+    $implementations['multiple_select'] = $group;
+    break;
+  }
+}