diff --git a/htdocs/core/class/dolgraph.class.php b/htdocs/core/class/dolgraph.class.php
index 0f823984fa2..141ac1e0e85 100644
--- a/htdocs/core/class/dolgraph.class.php
+++ b/htdocs/core/class/dolgraph.class.php
@@ -1144,7 +1144,7 @@ class DolGraph
 			foreach ($legends as $val)	// Loop on each serie
 			{
 				if ($i > 0) $this->stringtoshow .= ', ';
-				$this->stringtoshow .= "'".dol_trunc($val,32)."'";
+				$this->stringtoshow .= "'".dol_escape_js(dol_trunc($val,32))."'";
 				$i++;
 			}
 
@@ -1207,7 +1207,7 @@ class DolGraph
 			foreach ($legends as $val)	// Loop on each serie
 			{
 				if ($i > 0) $this->stringtoshow .= ', ';
-				$this->stringtoshow .= "'".$val."'";
+				$this->stringtoshow .= "'".dol_escape_js(dol_trunc($val,32))."'";
 				$i++;
 			}