diff --git a/.changes/unreleased/Fixed-20231129-221501.yaml b/.changes/unreleased/Fixed-20231129-221501.yaml
new file mode 100644
index 000000000..f26209afe
--- /dev/null
+++ b/.changes/unreleased/Fixed-20231129-221501.yaml
@@ -0,0 +1,5 @@
+kind: Fixed
+body: Fix error in ListEvaluation when "handling agents" are alone
+time: 2023-11-29T22:15:01.627103072+01:00
+custom:
+  Issue: ""
diff --git a/src/Bundle/ChillMainBundle/Export/Helper/UserHelper.php b/src/Bundle/ChillMainBundle/Export/Helper/UserHelper.php
index 46e19c2d1..39fb83c57 100644
--- a/src/Bundle/ChillMainBundle/Export/Helper/UserHelper.php
+++ b/src/Bundle/ChillMainBundle/Export/Helper/UserHelper.php
@@ -92,6 +92,11 @@ class UserHelper
             }
             $asStrings = [];
 
+            if (array_key_exists('uid', $decoded) || is_numeric($decoded)) {
+                // this is a single value. We have to wrap it into an array
+                $decoded = [$decoded];
+            }
+
             foreach ($decoded as $userId) {
                 if (is_array($userId)) {
                     $uid = $userId['uid'];
diff --git a/src/Bundle/ChillPersonBundle/Export/Export/ListEvaluation.php b/src/Bundle/ChillPersonBundle/Export/Export/ListEvaluation.php
index 6b3eba107..a2bedcddd 100644
--- a/src/Bundle/ChillPersonBundle/Export/Export/ListEvaluation.php
+++ b/src/Bundle/ChillPersonBundle/Export/Export/ListEvaluation.php
@@ -193,6 +193,7 @@ class ListEvaluation implements ListInterface, GroupedExportInterface
     public function initiateQuery(array $requiredModifiers, array $acl, array $data = [])
     {
         $centers = array_map(static fn ($el) => $el['center'], $acl);
+        $calcDate = $data['calc_date'] ?? new RollingDate(RollingDate::T_TODAY);
 
         $qb = $this->entityManager->createQueryBuilder();
 
@@ -208,7 +209,7 @@ class ListEvaluation implements ListInterface, GroupedExportInterface
             ->andWhere('acppart.startDate != acppart.endDate OR acppart.endDate IS NULL')
             // get participants at the given date
             ->andWhere('acppart.startDate <= :calc_date AND (acppart.endDate > :calc_date OR acppart.endDate IS NULL)')
-            ->setParameter('calc_date', $this->rollingDateConverter->convert($data['calc_date']));
+            ->setParameter('calc_date', $this->rollingDateConverter->convert($calcDate));
 
         if ($this->filterStatsByCenters) {
             $qb
@@ -224,7 +225,7 @@ class ListEvaluation implements ListInterface, GroupedExportInterface
 
         AccompanyingCourseExportHelper::addClosingMotiveExclusionClause($qb);
 
-        $this->addSelectClauses($qb, $this->rollingDateConverter->convert($data['calc_date']));
+        $this->addSelectClauses($qb, $this->rollingDateConverter->convert($calcDate));
 
         return $qb;
     }
@@ -278,7 +279,7 @@ class ListEvaluation implements ListInterface, GroupedExportInterface
         // referrers => at date XXXX
         $qb
             ->addSelect('(SELECT JSON_BUILD_OBJECT(\'uid\', IDENTITY(history.user), \'d\', history.startDate) FROM '.UserHistory::class.' history '.
-                'WHERE history.accompanyingPeriod = acp AND history.startDate <= :calc_date AND (history.endDate IS NULL OR history.endDate > :calc_date)) AS referrers');
+                'WHERE history.accompanyingPeriod = acp AND history.startDate <= :calc_date AND (history.endDate IS NULL OR history.endDate > :calc_date)) AS acpw_referrers');
 
         // persons
         $qb