diff --git a/erpnext/stock/utils.py b/erpnext/stock/utils.py
index b8c5187..feb0e2b 100644
--- a/erpnext/stock/utils.py
+++ b/erpnext/stock/utils.py
@@ -269,8 +269,6 @@
 	if isinstance(args, str):
 		args = json.loads(args)
 
-	voucher_no = args.get("voucher_no") or args.get("name")
-
 	in_rate = None
 	if (args.get("serial_no") or "").strip():
 		in_rate = get_avg_purchase_rate(args.get("serial_no"))
@@ -293,12 +291,13 @@
 				in_rate = (
 					_get_fifo_lifo_rate(previous_stock_queue, args.get("qty") or 0, valuation_method)
 					if previous_stock_queue
-					else 0
+					else None
 				)
 		elif valuation_method == "Moving Average":
-			in_rate = previous_sle.get("valuation_rate") or 0
+			in_rate = previous_sle.get("valuation_rate")
 
 	if in_rate is None:
+		voucher_no = args.get("voucher_no") or args.get("name")
 		in_rate = get_valuation_rate(
 			args.get("item_code"),
 			args.get("warehouse"),