diff --git a/erpnext/accounts/doctype/sales_invoice/sales_invoice.py b/erpnext/accounts/doctype/sales_invoice/sales_invoice.py
index 8d099d1..3750c2d 100644
--- a/erpnext/accounts/doctype/sales_invoice/sales_invoice.py
+++ b/erpnext/accounts/doctype/sales_invoice/sales_invoice.py
@@ -918,7 +918,7 @@
 		for entry in self.payments:
 			if entry.amount < 0:
 				frappe.throw(_("Row #{0} (Payment Table): Amount must be positive").format(entry.idx))
-	
+
 	def book_income_for_deferred_revenue(self):
 		# book the income on the last day, but it will be trigger on the 1st of month at 12:00 AM
 		# start_date: 1st of the last month or the start date