diff --git a/dictation_server/src/gateways/blobstorage/blobstorage.service.ts b/dictation_server/src/gateways/blobstorage/blobstorage.service.ts
index 4f81b5f..57dd908 100644
--- a/dictation_server/src/gateways/blobstorage/blobstorage.service.ts
+++ b/dictation_server/src/gateways/blobstorage/blobstorage.service.ts
@@ -51,14 +51,9 @@ export class BlobstorageService {
       this.configService.get('STORAGE_ACCOUNT_ENDPOINT_EU'),
       this.sharedKeyCredentialEU,
     );
-
-    const expireTime = Number(
+    this.sasTokenExpireHour = Number(
       this.configService.get('STORAGE_TOKEN_EXPIRE_TIME'),
     );
-    if (Number.isNaN(expireTime)) {
-      throw new Error(`STORAGE_TOKEN_EXPIRE_TIME is invalid value NaN`);
-    }
-    this.sasTokenExpireHour = expireTime;
   }
 
   /**