diff --git a/app/Services/FcmApiService.php b/app/Services/FcmApiService.php
index 817d23a0..f3ca3a5e 100644
--- a/app/Services/FcmApiService.php
+++ b/app/Services/FcmApiService.php
@@ -14,11 +14,11 @@ class FcmApiService
 {
     private string $baseUrl;
 
-    private string $apiKey;
+    private ?string $apiKey;
 
     public function __construct()
     {
-        $this->baseUrl = rtrim(config('services.api.base_url'), '/');
+        $this->baseUrl = rtrim(config('services.api.base_url', ''), '/');
         $this->apiKey = config('services.api.key');
     }