diff --git a/config/services.yaml b/config/services.yaml
index a9ab742..bd4d227 100644
--- a/config/services.yaml
+++ b/config/services.yaml
@@ -8,7 +8,7 @@ parameters:
     application_env: '%env(resolve:APP_ENV)%'
     application_api_key: '%env(resolve:APP_API_KEY)%'
     application_vendors: '%kernel.project_dir%/vendor/composer/installed.php'
-    application_version: '2.5.1'
+    application_version: '2.5.2'
     container.dumper.inline_factories: true
     cache.redis.namespace: '%env(default:cache.redis.namespace.default:REDIS_CACHE_NAMESPACE)%'
     cache.redis.namespace.default: 'devkit'
diff --git a/src/Action/Tool/Ajax/AcsServiceClientAction.php b/src/Action/Tool/Ajax/AcsServiceClientAction.php
index 13f8efc..bf59311 100644
--- a/src/Action/Tool/Ajax/AcsServiceClientAction.php
+++ b/src/Action/Tool/Ajax/AcsServiceClientAction.php
@@ -63,10 +63,10 @@ public function __invoke(Request $request): Response
             $request->get('acsSub'),
             $request->get('acsAction'),
             $date,
-            (int)$request->get('acsAttemptNumber'),
+            (int)$request->get('acsAttemptNumber') ?: 1,
             $request->get('acsIss'),
-            (int)$request->get('acsExtraTime'),
-            (float)$request->get('acsSeverity'),
+            $request->get('acsExtraTime') === '' ? null : (int)$request->get('acsExtraTime'),
+            $request->get('acsSeverity') === '' ? null : (float)$request->get('acsSeverity'),
             $request->get('acsReasonCode'),
             $request->get('acsReasonMessage')
         );