diff --git a/lib/BladeOne.php b/lib/BladeOne.php
index d7f1957..21d35b0 100644
--- a/lib/BladeOne.php
+++ b/lib/BladeOne.php
@@ -189,7 +189,7 @@ class BladeOne
     /** @var string it is a relative path calculated between baseUrl and the current url. Example ../../ */
     protected string $relativePath = '';
     /** @var string[] Dictionary of assets */
-    protected ?array $assetDict;
+    protected array $assetDict = [];
     /** @var bool if true then it removes tabs and unneeded spaces */
     protected bool $optimize = true;
     /** @var bool if false, then the template is not compiled (but executed on memory). */