Update additional_salary.py
diff --git a/erpnext/payroll/doctype/additional_salary/additional_salary.py b/erpnext/payroll/doctype/additional_salary/additional_salary.py
index cf2bff0..e3dc907 100644
--- a/erpnext/payroll/doctype/additional_salary/additional_salary.py
+++ b/erpnext/payroll/doctype/additional_salary/additional_salary.py
@@ -44,7 +44,7 @@
additional_salaries = [salary.name for salary in additional_salaries]
- if len(additional_salaries):
+ if additional_salaries and len(additional_salaries):
frappe.throw(_("Additional Salary: {0} already exist for Salary Component: {1} for period {2} and {3}").format(
bold(comma_and(additional_salaries)),
bold(self.salary_component),