.../src/Plugin/CKEditor4To5Upgrade/Contrib.php         | 18 ++----------------
 1 file changed, 2 insertions(+), 16 deletions(-)

diff --git a/core/modules/ckeditor5/src/Plugin/CKEditor4To5Upgrade/Contrib.php b/core/modules/ckeditor5/src/Plugin/CKEditor4To5Upgrade/Contrib.php
index 31e17fb2c6..ca24398b7b 100644
--- a/core/modules/ckeditor5/src/Plugin/CKEditor4To5Upgrade/Contrib.php
+++ b/core/modules/ckeditor5/src/Plugin/CKEditor4To5Upgrade/Contrib.php
@@ -46,28 +46,14 @@ public function mapCKEditor4ToolbarButtonToCKEditor5ToolbarItem(string $cke4_but
    * {@inheritdoc}
    */
   public function mapCKEditor4SettingsToCKEditor5Configuration(string $cke4_plugin_id, array $cke4_plugin_settings): ?array {
-    switch ($cke4_plugin_id) {
-      case NULL:
-        // Do Nothing.
-        break;
-
-      default:
-        throw new \OutOfBoundsException();
-    }
+    throw new \OutOfBoundsException();
   }
 
   /**
    * {@inheritdoc}
    */
   public function computeCKEditor5PluginSubsetConfiguration(string $cke5_plugin_id, FilterFormatInterface $text_format): ?array {
-    switch ($cke5_plugin_id) {
-      case NULL:
-        // Do Nothing.
-        break;
-
-      default:
-        throw new \OutOfBoundsException();
-    }
+    throw new \OutOfBoundsException();
   }
 
 }