diff --git a/erpnext/selling/doctype/sales_order/sales_order.py b/erpnext/selling/doctype/sales_order/sales_order.py
index f6ee48e..9a35aed 100755
--- a/erpnext/selling/doctype/sales_order/sales_order.py
+++ b/erpnext/selling/doctype/sales_order/sales_order.py
@@ -341,9 +341,11 @@
 
 			delivered_qty += item.delivered_qty
 			tot_qty += item.qty
-
-		self.db_set("per_delivered", flt(delivered_qty/tot_qty) * 100,
-			update_modified=False)
+		
+		if tot_qty != 0:
+			self.db_set("per_delivered", flt(delivered_qty/tot_qty) * 100,
+				update_modified=False)
+		
 
 	def set_indicator(self):
 		"""Set indicator for portal"""