diff --git a/src/Bundle/ChillPersonBundle/Export/Export/ListPerson.php b/src/Bundle/ChillPersonBundle/Export/Export/ListPerson.php
index 50b0f3d72..d3bc2728a 100644
--- a/src/Bundle/ChillPersonBundle/Export/Export/ListPerson.php
+++ b/src/Bundle/ChillPersonBundle/Export/Export/ListPerson.php
@@ -425,7 +425,9 @@ class ListPerson implements ExportElementValidatedInterface, ListInterface
             if ('_header' === $value) {
                 return $this->translatableStringHelper->localize($cf->getName());
             }
-
+            if (null === $value) {
+                return '';
+            }
             return $this->customFieldProvider
                 ->getCustomFieldByType($cf->getType())
                 ->render(json_decode($value, true), $cf, 'csv');
@@ -434,6 +436,9 @@ class ListPerson implements ExportElementValidatedInterface, ListInterface
         if ($cfType instanceof CustomFieldChoice && $cfType->isMultiple($cf)) {
             return function ($value) use ($cf, $cfType, $key) {
                 $slugChoice = $this->extractInfosFromSlug($key)['additionnalInfos']['choiceSlug'];
+                if (null === $value) {
+                    return '';
+                }
                 $decoded = json_decode($value, true);
 
                 if ('_header' === $value) {
@@ -459,7 +464,7 @@ class ListPerson implements ExportElementValidatedInterface, ListInterface
      */
     private function slugToDQL(string $slug, string $type = 'default', array $additionalInfos = []): string
     {
-        $uid = 'slug_' . uniqid('', true);
+        $uid = 'slug_' . uniqid('', false);
 
         $this->slugs[$uid] = [
             'slug' => $slug,