diff --git a/erpnext/accounts/doctype/sales_invoice/sales_invoice.py b/erpnext/accounts/doctype/sales_invoice/sales_invoice.py
index 31a9c66..06e1e58 100644
--- a/erpnext/accounts/doctype/sales_invoice/sales_invoice.py
+++ b/erpnext/accounts/doctype/sales_invoice/sales_invoice.py
@@ -506,8 +506,8 @@
 		for i in dic:
 			if frappe.db.get_single_value('Selling Settings', dic[i][0]) == 'Yes':
 				for d in self.get('items'):
-					if frappe.get_cached_value('Item', d.item_code, 'is_stock_item') == 1 \
-						and not d.get(i.lower().replace(' ','_')) and not self.get(dic[i][1]):
+					if (d.item_code and frappe.get_cached_value('Item', d.item_code, 'is_stock_item') == 1
+						and not d.get(i.lower().replace(' ','_')) and not self.get(dic[i][1])):
 						msgprint(_("{0} is mandatory for Item {1}").format(i,d.item_code), raise_exception=1)