diff --git a/app/plugins/CoreAssigner/src/Model/Table/FormatAssignersTable.php b/app/plugins/CoreAssigner/src/Model/Table/FormatAssignersTable.php
index 67dd1aa74..759b4caea 100644
--- a/app/plugins/CoreAssigner/src/Model/Table/FormatAssignersTable.php
+++ b/app/plugins/CoreAssigner/src/Model/Table/FormatAssignersTable.php
@@ -145,7 +145,7 @@ public function assign($ia, $entity): string {
         $ia->format_assigner->id,
         $sequenced,
         $ia->format_assigner->collision_mode,
-        $ia->format_assigner->minimum,
+        $ia->format_assigner->minimum ?? 0,
         $ia->format_assigner->maximum
       );