diff --git a/Layout/default/Workflow/form.php b/Layout/default/Workflow/form.php
index 87b58b7b6..93edf4fd4 100644
--- a/Layout/default/Workflow/form.php
+++ b/Layout/default/Workflow/form.php
@@ -60,7 +60,7 @@
       <small
         class="text-info text-mono"
         <?php if($item->value->changed): ?>
-          title="Geändert: <?=date("d.m.Y H:i",$item->value->changed)?> von <?=$item->value->changer->name?> (<?=$item->value->changer->address->getCompanyOrName(true)?>)"
+          title="Geändert: <?=date("d.m.Y H:i",$item->value->changed)?> von <?=$item->value->changer->name?> (<?=isset($item->value->changer->address) ? $item->value->changer->address->getCompanyOrName(true) : "Unbekannt"?>)"          ?>)"
         <?php endif; ?>
         >
         <?php if($item->value->changed): ?>