diff --git a/erpnext/manufacturing/doctype/work_order/test_work_order.py b/erpnext/manufacturing/doctype/work_order/test_work_order.py
index 36466ff..f568264 100644
--- a/erpnext/manufacturing/doctype/work_order/test_work_order.py
+++ b/erpnext/manufacturing/doctype/work_order/test_work_order.py
@@ -1154,6 +1154,36 @@
 		except frappe.MandatoryError:
 			self.fail("Batch generation causing failing in Work Order")
 
+	@change_settings("Manufacturing Settings", {"make_serial_no_batch_from_work_order": 1})
+	def test_auto_serial_no_creation(self):
+		from erpnext.manufacturing.doctype.bom.test_bom import create_nested_bom
+
+		fg_item = frappe.generate_hash(length=20)
+		child_item = frappe.generate_hash(length=20)
+
+		bom_tree = {fg_item: {child_item: {}}}
+
+		create_nested_bom(bom_tree, prefix="")
+
+		item = frappe.get_doc("Item", fg_item)
+		item.has_serial_no = 1
+		item.serial_no_series = f"{item.name}.#####"
+		item.save()
+
+		try:
+			wo_order = make_wo_order_test_record(item=fg_item, qty=2, skip_transfer=True)
+			serial_nos = wo_order.serial_no
+			stock_entry = frappe.get_doc(make_stock_entry(wo_order.name, "Manufacture", 10))
+			stock_entry.set_work_order_details()
+			stock_entry.set_serial_no_batch_for_finished_good()
+			for row in stock_entry.items:
+				if row.item_code == fg_item:
+					self.assertTrue(row.serial_no)
+					self.assertEqual(sorted(get_serial_nos(row.serial_no)), sorted(get_serial_nos(serial_nos)))
+
+		except frappe.MandatoryError:
+			self.fail("Batch generation causing failing in Work Order")
+
 	@change_settings(
 		"Manufacturing Settings",
 		{"backflush_raw_materials_based_on": "Material Transferred for Manufacture"},
diff --git a/erpnext/stock/doctype/stock_entry/stock_entry.py b/erpnext/stock/doctype/stock_entry/stock_entry.py
index d9b9f12..d401f81 100644
--- a/erpnext/stock/doctype/stock_entry/stock_entry.py
+++ b/erpnext/stock/doctype/stock_entry/stock_entry.py
@@ -2236,16 +2236,16 @@
 			d.qty -= process_loss_dict[d.item_code][1]
 
 	def set_serial_no_batch_for_finished_good(self):
-		serial_nos = ""
+		serial_nos = []
 		if self.pro_doc.serial_no:
-			serial_nos = self.get_serial_nos_for_fg()
+			serial_nos = self.get_serial_nos_for_fg() or []
 
 		for row in self.items:
 			if row.is_finished_item and row.item_code == self.pro_doc.production_item:
 				if serial_nos:
 					row.serial_no = "\n".join(serial_nos[0 : cint(row.qty)])
 
-	def get_serial_nos_for_fg(self, args):
+	def get_serial_nos_for_fg(self):
 		fields = [
 			"`tabStock Entry`.`name`",
 			"`tabStock Entry Detail`.`qty`",
@@ -2261,9 +2261,7 @@
 		]
 
 		stock_entries = frappe.get_all("Stock Entry", fields=fields, filters=filters)
-
-		if self.pro_doc.serial_no:
-			return self.get_available_serial_nos(stock_entries)
+		return self.get_available_serial_nos(stock_entries)
 
 	def get_available_serial_nos(self, stock_entries):
 		used_serial_nos = []