diff -u b/core/modules/inline_form_errors/src/FormErrorHandler.php b/core/modules/inline_form_errors/src/FormErrorHandler.php
--- b/core/modules/inline_form_errors/src/FormErrorHandler.php
+++ b/core/modules/inline_form_errors/src/FormErrorHandler.php
@@ -55,7 +55,7 @@
   protected function displayErrorMessages(array $form, FormStateInterface $form_state) {
     // Use the original error display for Quick Edit forms, because in this case
     // the errors are already near the form element.
-    if ($form['#form_id'] == 'quickedit_field_form') {
+    if ($form['#form_id'] === 'quickedit_field_form') {
       parent::displayErrorMessages($form, $form_state);
       return;
     }