diff --git a/tool/secrets.dart b/tool/secrets.dart
index 986af0c..389f56a 100644
--- a/tool/secrets.dart
+++ b/tool/secrets.dart
@@ -4,7 +4,7 @@ import 'dart:io';
 Future<void> main() async {
   final config = {
     'syncfusion_license_key': Platform.environment['SYNCFUSION_LICENSE_KEY'],
-    'version_type': Platform.environment['HA_CLIENT_VERSION_TYPE']
+    'version_type': Platform.environment['HA_CLIENT_VERSION_TYPE'] ?? ''
   };
 
   final filename = 'lib/.secrets.dart';