diff --git a/htdocs/core/boxes/box_graph_invoices_permonth.php b/htdocs/core/boxes/box_graph_invoices_permonth.php
index 1b54d917d05..d098106724c 100644
--- a/htdocs/core/boxes/box_graph_invoices_permonth.php
+++ b/htdocs/core/boxes/box_graph_invoices_permonth.php
@@ -132,7 +132,9 @@ class box_graph_invoices_permonth extends ModeleBoxes
 				$mesg = $px1->isGraphKo();
 				if (! $mesg)
 				{
-					$px1->SetData($data1);
+				    $langs->load("bills");
+				    
+				    $px1->SetData($data1);
 					unset($data1);
 					$px1->SetPrecisionY(0);
 					$i=$startyear;$legend=array();