diff --git a/src/Library/Logger.php b/src/Library/Logger.php
index bd03f3c..bfdb3b0 100644
--- a/src/Library/Logger.php
+++ b/src/Library/Logger.php
@@ -17,7 +17,7 @@ class Logger
     private string $message = '';
     private ?array $data = null;
     private ?Throwable $throwable = null;
-    private string $traceId = '';
+    private ?string $traceId = '';
     private array $context = [];
     private bool $isError = false;