diff --git a/src/Library/Logger.php b/src/Library/Logger.php
index d54fd74..bd03f3c 100644
--- a/src/Library/Logger.php
+++ b/src/Library/Logger.php
@@ -39,7 +39,7 @@ class Logger
         return $this;
     }
 
-    public function setTraceId(string $traceId): static
+    public function setTraceId(?string $traceId): static
     {
         $this->traceId = $traceId;
         return $this;