diff --git a/src/Immoscout/ApiRequest.php b/src/Immoscout/ApiRequest.php
index 96d2d36..243a675 100644
--- a/src/Immoscout/ApiRequest.php
+++ b/src/Immoscout/ApiRequest.php
@@ -28,6 +28,9 @@ public function __construct(?array $auth = null, ?string $user = null)
     {
         $this->client = $this->getPreparedClient($auth);
         $this->user = $user ?? $_ENV['IMSC_USERNAME'] ?? 'me';
+        if (trim($this->user) === '') {
+            $this->user = 'me';
+        }
     }
 
     /**