diff --git a/erpnext/buying/doctype/purchase_order/purchase_order.py b/erpnext/buying/doctype/purchase_order/purchase_order.py
index d4f1de1..e0781f1 100644
--- a/erpnext/buying/doctype/purchase_order/purchase_order.py
+++ b/erpnext/buying/doctype/purchase_order/purchase_order.py
@@ -85,6 +85,7 @@
 			frappe.msgprint(_("{0} currently has a {1} Supplier Scorecard standing, and Purchase Orders to this supplier should be issued with caution.").format(self.supplier, standing), title=_("Caution"), indicator='orange')
 
 	def validate_minimum_order_qty(self):
+		if not self.get("items"): return
 		items = list(set([d.item_code for d in self.get("items")]))
 
 		itemwise_min_order_qty = frappe._dict(frappe.db.sql("""select name, min_order_qty