diff --git a/src/Handler/ContainerHandler.php b/src/Handler/ContainerHandler.php
index b49acbc..cdc19d0 100644
--- a/src/Handler/ContainerHandler.php
+++ b/src/Handler/ContainerHandler.php
@@ -169,6 +169,10 @@ public static function afterClassLikeVisit(AfterClassLikeVisitEvent $event)
 
     public static function afterCodebasePopulated(AfterCodebasePopulatedEvent $event): void
     {
+        if (null === self::$containerMeta) {
+            return;
+        }
+
         $containerClassNames = array_map(function (string $className): string {
             return strtolower($className);
         }, self::$containerMeta->getClassNames());