diff --git a/src/CodeVisitor.php b/src/CodeVisitor.php
index da87f6e4..c9662660 100644
--- a/src/CodeVisitor.php
+++ b/src/CodeVisitor.php
@@ -73,7 +73,7 @@ private function validateClass(Class_ $class): void
      */
     private function enterNodeClass(Node $node)
     {
-        if ($node instanceof Class_) {
+        if ($node instanceof Class_ && $node->name !== null) {
             $this->validateClass($node);
             $this->class = $node;