diff --git a/include/class.pdf.php b/include/class.pdf.php
index 05e5b13de761c5440bd2cb6b15bca7fd75e2092e..1555de7727ec8b70848585470a643538b4ac9343 100644
--- a/include/class.pdf.php
+++ b/include/class.pdf.php
@@ -202,7 +202,7 @@ class Ticket2PDF extends mPDF
 
             $closedby = 'unknown';
             if(($staff = $ticket->getStaff()))
-                $closedby = $staff->getName();
+                $closedby = (string) $staff->getName();
 
             $this->WriteCell($l, 7, 'Closed By', 1, 0, 'L', true);
             $this->SetFont('');