diff --git a/src/ozonetel/ozonetel-admin-auth.service.ts b/src/ozonetel/ozonetel-admin-auth.service.ts
index 46f0b0c..d3c70ca 100644
--- a/src/ozonetel/ozonetel-admin-auth.service.ts
+++ b/src/ozonetel/ozonetel-admin-auth.service.ts
@@ -113,7 +113,7 @@ export class OzonetelAdminAuthService implements OnModuleInit {
         }
 
         this.logger.log(`Ozonetel admin login successful (userId=${this.cachedUserId}, expires in ${Math.round((this.tokenExpiresAt - Date.now()) / 60000)}min)`);
-        return this.cachedToken;
+        return this.cachedToken!;
     }
 
     isConfigured(): boolean {