diff --git a/src/EventSubscriber/ReadOnlyFormSubscriber.php b/src/EventSubscriber/ReadOnlyFormSubscriber.php
index 85554fe..de02d0a 100644
--- a/src/EventSubscriber/ReadOnlyFormSubscriber.php
+++ b/src/EventSubscriber/ReadOnlyFormSubscriber.php
@@ -18,6 +18,13 @@ class ReadOnlyFormSubscriber implements EventSubscriberInterface {
   use ConfigReadonlyWhitelistTrait;
 
   /**
+   * The module handler.
+   *
+   * @var \Drupal\Core\Extension\ModuleHandlerInterface
+   */
+  protected $moduleHandler;
+
+  /**
    * ReadOnlyFormSubscriber constructor.
    *
    * @param \Drupal\Core\Extension\ModuleHandlerInterface $module_handler
@@ -64,7 +71,7 @@ class ReadOnlyFormSubscriber implements EventSubscriberInterface {
     }
 
     // Don't block particular patterns.
-    if ($mark_form_read_only && $form_object instanceof EntityFormInterface) {
+    elseif ($mark_form_read_only && $form_object instanceof EntityFormInterface) {
       $entity = $form_object->getEntity();
       $name = $entity->getConfigDependencyName();
       if ($this->matchesWhitelistPattern($name)) {