diff --git a/htdocs/core/class/html.form.class.php b/htdocs/core/class/html.form.class.php
index 0ed036f1d1f..cebd49737e5 100644
--- a/htdocs/core/class/html.form.class.php
+++ b/htdocs/core/class/html.form.class.php
@@ -3388,13 +3388,19 @@ class Form
 
 			while($res = $this->db->fetch_object($resql))
 			{
+			    $unitLabel = $res->label;
+			    if (! empty($langs->tab_translate['unit'.$res->code]))	// check if Translation is available before
+			    {
+			        $unitLabel = $langs->trans('unit'.$res->code)!=$res->label?$langs->trans('unit'.$res->code):$res->label;
+			    }
+			    
 				if ($selected == $res->rowid)
 				{
-					$return.='<option value="'.$res->rowid.'" selected>'.($langs->trans('unit'.$res->code)!=$res->label?$langs->trans('unit'.$res->code):$res->label).'</option>';
+				    $return.='<option value="'.$res->rowid.'" selected>'.$unitLabel.'</option>';
 				}
 				else
 				{
-					$return.='<option value="'.$res->rowid.'">'.($langs->trans('unit'.$res->code)!=$res->label?$langs->trans('unit'.$res->code):$res->label).'</option>';
+				    $return.='<option value="'.$res->rowid.'">'.$unitLabel.'</option>';
 				}
 			}
 			$return.='</select>';