diff --git a/core/lib/Drupal/Core/Asset/LibraryDiscoveryCollector.php b/core/lib/Drupal/Core/Asset/LibraryDiscoveryCollector.php
index 7ab83d5..21a81b9 100644
--- a/core/lib/Drupal/Core/Asset/LibraryDiscoveryCollector.php
+++ b/core/lib/Drupal/Core/Asset/LibraryDiscoveryCollector.php
@@ -84,4 +84,13 @@ protected function resolveCacheMiss($key) {
 
     return $this->storage[$key];
   }
+
+  /**
+   * {@inheritdoc}
+   */
+  public function reset() {
+    parent::reset();
+    $this->cid = NULL;
+  }
+
 }