diff --git a/erpnext/controllers/subcontracting_controller.py b/erpnext/controllers/subcontracting_controller.py
index 17a2b07..eac35b0 100644
--- a/erpnext/controllers/subcontracting_controller.py
+++ b/erpnext/controllers/subcontracting_controller.py
@@ -539,6 +539,10 @@
 	def __add_supplied_item(self, item_row, bom_item, qty):
 		bom_item.conversion_factor = item_row.conversion_factor
 		rm_obj = self.append(self.raw_material_table, bom_item)
+		if rm_obj.get("qty"):
+			# Qty field not exists
+			rm_obj.qty = 0.0
+
 		rm_obj.reference_name = item_row.name
 
 		if self.doctype == self.subcontract_data.order_doctype: