diff --git a/modules/setup/library/Setup/RequirementSet.php b/modules/setup/library/Setup/RequirementSet.php
index 4c5bb121a..672fad454 100644
--- a/modules/setup/library/Setup/RequirementSet.php
+++ b/modules/setup/library/Setup/RequirementSet.php
@@ -290,7 +290,7 @@ class RequirementSet implements RecursiveIterator
      */
     public function valid(): bool
     {
-        return $this->key() !== null;
+        return key($this->requirements) !== null;
     }
 
     /**