diff --git a/src/PhpDocument.php b/src/PhpDocument.php
index e24b9ac..575a5e6 100644
--- a/src/PhpDocument.php
+++ b/src/PhpDocument.php
@@ -325,7 +325,7 @@ class PhpDocument
      */
     public function getDefinitions()
     {
-        return $this->definitions;
+        return $this->definitions ?? [];
     }
 
     /**