diff --git a/.changes/unreleased/Fixed-20260115-132538.yaml b/.changes/unreleased/Fixed-20260115-132538.yaml
new file mode 100644
index 000000000..3b671b12e
--- /dev/null
+++ b/.changes/unreleased/Fixed-20260115-132538.yaml
@@ -0,0 +1,6 @@
+kind: Fixed
+body: 'Fix: acc periods of which user is the referrer should not be included if when the list is filtered by center and none of the participations are part of the center'
+time: 2026-01-15T13:25:38.269774735+01:00
+custom:
+    Issue: "491"
+    SchemaChange: No schema change
diff --git a/src/Bundle/ChillPersonBundle/Export/Helper/FilterListAccompanyingPeriodHelper.php b/src/Bundle/ChillPersonBundle/Export/Helper/FilterListAccompanyingPeriodHelper.php
index e631051a0..a86c29d14 100644
--- a/src/Bundle/ChillPersonBundle/Export/Helper/FilterListAccompanyingPeriodHelper.php
+++ b/src/Bundle/ChillPersonBundle/Export/Helper/FilterListAccompanyingPeriodHelper.php
@@ -44,12 +44,10 @@ final readonly class FilterListAccompanyingPeriodHelper implements FilterListAcc
         };
 
         // add filtering on confidential accompanying period. The confidential is applyed on the current status of
-        // the accompanying period (we do not use the 'calc_date' here
-        $aclConditionsOrX = $qb->expr()->orX(
-            // either the current user is the refferer for the course
-            'acp.user = :list_acp_current_user',
-        );
-        $qb->setParameter('list_acp_current_user', $user);
+        // the accompanying period (we do not use the 'calc_date' here)
+        //
+        // IMPORTANT: we must NOT bypass selected centers just because the current user is the referrer.
+        $aclConditionsOrX = $qb->expr()->orX();
 
         $i = 0;
         foreach ($centers as $center) {
@@ -93,6 +91,12 @@ final readonly class FilterListAccompanyingPeriodHelper implements FilterListAcc
             ++$i;
         }
 
-        $qb->andWhere($aclConditionsOrX);
+        // Prevent invalid/empty WHERE when no conditions were added (e.g., no centers available)
+        if (method_exists($aclConditionsOrX, 'getParts') && 0 === count($aclConditionsOrX->getParts())) {
+            // No allowed conditions => return no rows
+            $qb->andWhere('1 = 0');
+        } else {
+            $qb->andWhere($aclConditionsOrX);
+        }
     }
 }