Merge pull request #9704 from rohitwaghchaure/serial_no_not_found_issue

Fixed the issue Serial No serial no not found

erpnext/accounts/doctype/sales_invoice/sales_invoice.py

@@ -803,6 +803,7 @@ class SalesInvoice(SellingController):
 				continue
 
 			for serial_no in item.serial_no.split("\n"):
+				if serial_no and frappe.db.exists('Serial No', serial_no):
 					sno = frappe.get_doc('Serial No', serial_no)
 					sno.sales_invoice = invoice
 					sno.db_update()