diff --git a/backend-api/config/passport.php b/backend-api/config/passport.php
index 06053cd..8d4f34b 100644
--- a/backend-api/config/passport.php
+++ b/backend-api/config/passport.php
@@ -26,9 +26,10 @@
     |
     */
 
-    'private_key' => env('PASSPORT_PRIVATE_KEY'),
+    'private_key' => env('PASSPORT_PRIVATE_KEY', null),
+
+    'public_key' => env('PASSPORT_PUBLIC_KEY', null),
 
-    'public_key' => env('PASSPORT_PUBLIC_KEY'),
 
     /*
     |--------------------------------------------------------------------------