diff --git a/src/config/config.php b/src/config/config.php
index dca9357..56b1754 100644
--- a/src/config/config.php
+++ b/src/config/config.php
@@ -160,7 +160,7 @@
     | /path/to/file = create a new log at the given file path
     |--------------------------------------------------------------------------
     */
-    'cas_log' => env('CAS_LOG'),
+    'cas_log' => env('CAS_LOG', null),
 
     /*
     |--------------------------------------------------------------------------