diff --git a/src/Bundle/ChillActivityBundle/Export/Aggregator/ACPAggregators/ByActivityTypeAggregator.php b/src/Bundle/ChillActivityBundle/Export/Aggregator/ACPAggregators/ByActivityTypeAggregator.php
index 79af0d8fe..b717301dc 100644
--- a/src/Bundle/ChillActivityBundle/Export/Aggregator/ACPAggregators/ByActivityTypeAggregator.php
+++ b/src/Bundle/ChillActivityBundle/Export/Aggregator/ACPAggregators/ByActivityTypeAggregator.php
@@ -53,7 +53,7 @@ final readonly class ByActivityTypeAggregator implements AggregatorInterface
 
     public function normalizeFormData(array $formData): array
     {
-        return ['after_date' => $formData['after_date']->normalize(), 'before_date' => $formData['before_date']->normalize()];
+        return ['after_date' => $formData['after_date']?->normalize(), 'before_date' => $formData['before_date']?->normalize()];
     }
 
     public function denormalizeFormData(array $formData, int $fromVersion): array