diff --git a/core/includes/form.inc b/core/includes/form.inc
index 03b6fdc..27c0ab9 100644
--- a/core/includes/form.inc
+++ b/core/includes/form.inc
@@ -1856,16 +1856,18 @@ function form_builder($form_id, &$element, &$form_state) {
     '#title_display' => 'before',
   );
 
-  // Cheks if the element needs property validation.
+  // Checks if the element needs property validation.
   if (isset($element['#property_validate']) && is_array($element['#property_validate'])) {
     // Validates required properties.
-    foreach (array_filter($element['#property_validate']) as $property => $callback) {
-      if (!isset($element[$property]) || !$callback($element) == TRUE) {
-        throw new \UnexpectedValueException(t('@type element in form @form_id has a non-valid @property property.', array(
-          '@type' => $element['#type'],
-          '@form_id' => $form_id,
-          '@property' => $property,
-      )));
+    foreach ($element['#property_validate'] as $property => $callbacks) {
+      foreach ($callbacks as $callback) {
+        if (!isset($element[$property]) || !$callback($element)) {
+          trigger_error(t("'@type' element in form '@form_id' has a non-valid '@property' property.", array(
+            '@type' => $element['#type'],
+            '@form_id' => $form_id,
+            '@property' => $property,
+          )), E_USER_ERROR);
+        }
       }
     }
   }
@@ -4025,7 +4027,12 @@ function form_process_vertical_tabs($element, &$form_state) {
 
   // Details within a vertical tab do not require a title.
   $details_validation = element_info_property('details', '#property_validate');
-  unset($details_validation['#title']);
+  if (isset($details_validation['#title'])) {
+    $key = array_search('element_validate_title', $details_validation['#title']);
+    if ($key !== FALSE) {
+      unset($details_validation['#title'][$key]);
+    }
+  }
   $element['group']['#property_validate'] = $details_validation;
 
   // Add an invisible label for accessibility.
diff --git a/core/modules/node/lib/Drupal/node/Plugin/Condition/NodeType.php b/core/modules/node/lib/Drupal/node/Plugin/Condition/NodeType.php
index 4f30bb7..8622a93 100644
--- a/core/modules/node/lib/Drupal/node/Plugin/Condition/NodeType.php
+++ b/core/modules/node/lib/Drupal/node/Plugin/Condition/NodeType.php
@@ -39,6 +39,7 @@ public function buildForm(array $form, array &$form_state) {
       $options[$type->type] = $type->name;
     }
     $form['bundles'] = array(
+      '#title' => t('Node types'),
       '#type' => 'checkboxes',
       '#options' => $options,
       '#required' => TRUE,
diff --git a/core/modules/system/system.module b/core/modules/system/system.module
index 716679d..e30c6fd 100644
--- a/core/modules/system/system.module
+++ b/core/modules/system/system.module
@@ -330,7 +330,7 @@ function system_element_info() {
     '#process' => array('form_process_autocomplete', 'ajax_process_form', 'form_process_pattern'),
     '#pre_render' => array('form_pre_render_textfield'),
     '#property_validate' => array(
-      '#title' => 'element_validate_title',
+      '#title' => array('element_validate_title'),
     ),
     '#theme' => 'input__textfield',
     '#theme_wrappers' => array('form_element'),
@@ -343,7 +343,7 @@ function system_element_info() {
     '#process' => array('form_process_autocomplete', 'ajax_process_form', 'form_process_pattern'),
     '#pre_render' => array('form_pre_render_tel'),
     '#property_validate' => array(
-      '#title' => 'element_validate_title',
+      '#title' => array('element_validate_title'),
     ),
     '#theme' => 'input__tel',
     '#theme_wrappers' => array('form_element'),
@@ -358,7 +358,7 @@ function system_element_info() {
     '#element_validate' => array('form_validate_email'),
     '#pre_render' => array('form_pre_render_email'),
     '#property_validate' => array(
-      '#title' => 'element_validate_title',
+      '#title' => array('element_validate_title'),
     ),
     '#theme' => 'input__email',
     '#theme_wrappers' => array('form_element'),
@@ -372,7 +372,7 @@ function system_element_info() {
     '#element_validate' => array('form_validate_url'),
     '#pre_render' => array('form_pre_render_url'),
     '#property_validate' => array(
-      '#title' => 'element_validate_title',
+      '#title' => array('element_validate_title'),
     ),
     '#theme' => 'input__url',
     '#theme_wrappers' => array('form_element'),
@@ -385,7 +385,7 @@ function system_element_info() {
     '#process' => array('form_process_autocomplete', 'ajax_process_form'),
     '#pre_render' => array('form_pre_render_search'),
     '#property_validate' => array(
-      '#title' => 'element_validate_title',
+      '#title' => array('element_validate_title'),
     ),
     '#theme' => 'input__search',
     '#theme_wrappers' => array('form_element'),
@@ -397,7 +397,7 @@ function system_element_info() {
     '#element_validate' => array('form_validate_number'),
     '#pre_render' => array('form_pre_render_number'),
     '#property_validate' => array(
-      '#title' => 'element_validate_title',
+      '#title' => array('element_validate_title'),
     ),
     '#theme' => 'input__number',
     '#theme_wrappers' => array('form_element'),
@@ -411,7 +411,7 @@ function system_element_info() {
     '#element_validate' => array('form_validate_number'),
     '#pre_render' => array('form_pre_render_range'),
     '#property_validate' => array(
-      '#title' => 'element_validate_title',
+      '#title' => array('element_validate_title'),
     ),
     '#theme' => 'input__range',
     '#theme_wrappers' => array('form_element'),
@@ -422,7 +422,7 @@ function system_element_info() {
     '#element_validate' => array('form_validate_color'),
     '#pre_render' => array('form_pre_render_color'),
     '#property_validate' => array(
-      '#title' => 'element_validate_title',
+      '#title' => array('element_validate_title'),
     ),
     '#theme' => 'input__color',
     '#theme_wrappers' => array('form_element'),
@@ -438,7 +438,7 @@ function system_element_info() {
     '#element_validate' => array('form_validate_machine_name'),
     '#pre_render' => array('form_pre_render_textfield'),
     '#property_validate' => array(
-      '#title' => 'element_validate_title',
+      '#title' => array('element_validate_title'),
     ),
     '#theme' => 'input__textfield',
     '#theme_wrappers' => array('form_element'),
@@ -450,7 +450,7 @@ function system_element_info() {
     '#process' => array('ajax_process_form', 'form_process_pattern'),
     '#pre_render' => array('form_pre_render_password'),
     '#property_validate' => array(
-      '#title' => 'element_validate_title',
+      '#title' => array('element_validate_title'),
     ),
     '#theme' => 'input__password',
     '#theme_wrappers' => array('form_element'),
@@ -467,7 +467,7 @@ function system_element_info() {
     '#resizable' => 'vertical',
     '#process' => array('ajax_process_form'),
     '#property_validate' => array(
-      '#title' => 'element_validate_title',
+      '#title' => array('element_validate_title'),
     ),
     '#theme' => 'textarea',
     '#theme_wrappers' => array('form_element'),
@@ -476,7 +476,7 @@ function system_element_info() {
     '#input' => TRUE,
     '#process' => array('form_process_radios'),
     '#property_validate' => array(
-      '#title' => 'element_validate_title',
+      '#title' => array('element_validate_title'),
     ),
     '#theme_wrappers' => array('radios'),
     '#pre_render' => array('form_pre_render_conditional_form_element'),
@@ -487,7 +487,7 @@ function system_element_info() {
     '#process' => array('ajax_process_form'),
     '#pre_render' => array('form_pre_render_radio'),
     '#property_validate' => array(
-      '#title' => 'element_validate_title',
+      '#title' => array('element_validate_title'),
     ),
     '#theme' => 'input__radio',
     '#theme_wrappers' => array('form_element'),
@@ -498,7 +498,7 @@ function system_element_info() {
     '#process' => array('form_process_checkboxes'),
     '#pre_render' => array('form_pre_render_conditional_form_element'),
     '#property_validate' => array(
-      '#title' => 'element_validate_title',
+      '#title' => array('element_validate_title'),
     ),
     '#theme_wrappers' => array('checkboxes'),
   );
@@ -508,7 +508,7 @@ function system_element_info() {
     '#process' => array('form_process_checkbox', 'ajax_process_form'),
     '#pre_render' => array('form_pre_render_checkbox'),
     '#property_validate' => array(
-      '#title' => 'element_validate_title',
+      '#title' => array('element_validate_title'),
     ),
     '#theme' => 'input__checkbox',
     '#theme_wrappers' => array('form_element'),
@@ -519,7 +519,7 @@ function system_element_info() {
     '#multiple' => FALSE,
     '#process' => array('form_process_select', 'ajax_process_form'),
     '#property_validate' => array(
-      '#title' => 'element_validate_title',
+      '#title' => array('element_validate_title'),
     ),
     '#theme' => 'select',
     '#theme_wrappers' => array('form_element'),
@@ -529,7 +529,7 @@ function system_element_info() {
     '#input' => TRUE,
     '#default_value' => Language::LANGCODE_NOT_SPECIFIED,
     '#property_validate' => array(
-      '#title' => 'element_validate_title',
+      '#title' => array('element_validate_title'),
     ),
   );
   $types['weight'] = array(
@@ -538,13 +538,13 @@ function system_element_info() {
     '#default_value' => 0,
     '#process' => array('form_process_weight', 'ajax_process_form'),
     '#property_validate' => array(
-      '#title' => 'element_validate_title',
+      '#title' => array('element_validate_title'),
     ),
   );
   $types['date'] = array(
     '#input' => TRUE,
     '#property_validate' => array(
-      '#title' => 'element_validate_title',
+      '#title' => array('element_validate_title'),
     ),
     '#theme' => 'date',
     '#theme_wrappers' => array('form_element'),
@@ -556,7 +556,7 @@ function system_element_info() {
     '#size' => 60,
     '#pre_render' => array('form_pre_render_file'),
     '#property_validate' => array(
-      '#title' => 'element_validate_title',
+      '#title' => array('element_validate_title'),
     ),
     '#theme' => 'input__file',
     '#theme_wrappers' => array('form_element'),
@@ -604,7 +604,7 @@ function system_element_info() {
     '#process' => array('form_process_group', 'ajax_process_form'),
     '#pre_render' => array('form_pre_render_group'),
     '#property_validate' => array(
-      '#title' => 'element_validate_title',
+      '#title' => array('element_validate_title'),
     ),
     '#theme_wrappers' => array('fieldset'),
   );
@@ -614,7 +614,7 @@ function system_element_info() {
     '#process' => array('form_process_group', 'ajax_process_form'),
     '#pre_render' => array('form_pre_render_details', 'form_pre_render_group'),
     '#property_validate' => array(
-      '#title' => 'element_validate_title',
+      '#title' => array('element_validate_title'),
     ),
     '#theme_wrappers' => array('details'),
   );