diff -u b/core/lib/Drupal/Core/Transliteration/IntlTransliteration.php b/core/lib/Drupal/Core/Transliteration/IntlTransliteration.php
--- b/core/lib/Drupal/Core/Transliteration/IntlTransliteration.php
+++ b/core/lib/Drupal/Core/Transliteration/IntlTransliteration.php
@@ -47,7 +47,7 @@
       $map[$langcode] = BaseIntlTransliteration::DEFAULT_REMOVE_DIACRITICS_RULE;
       unset($this->transliteration);
     }
-    if (!$this->transliteration) {
+    if (empty($this->transliteration)) {
       $this->moduleHandler->alter('remove_diacritics_rules', $map);
       $this->transliteration = new BaseIntlTransliteration($map);
     }