diff --git a/erpnext/accounts/report/purchase_register/purchase_register.py b/erpnext/accounts/report/purchase_register/purchase_register.py
index c35995931039..a73c72c6d825 100644
--- a/erpnext/accounts/report/purchase_register/purchase_register.py
+++ b/erpnext/accounts/report/purchase_register/purchase_register.py
@@ -124,11 +124,10 @@ def get_columns(invoice_list, additional_table_columns):
 		_("Purchase Receipt") + ":Link/Purchase Receipt:100",
 		{"fieldname": "currency", "label": _("Currency"), "fieldtype": "Data", "width": 80},
 	]
-	expense_accounts = (
-		tax_accounts
-	) = (
-		expense_columns
-	) = tax_columns = unrealized_profit_loss_accounts = unrealized_profit_loss_account_columns = []
+
+	expense_accounts = []
+	tax_accounts = []
+	unrealized_profit_loss_accounts = []
 
 	if invoice_list:
 		expense_accounts = frappe.db.sql_list(
@@ -163,10 +162,11 @@ def get_columns(invoice_list, additional_table_columns):
 	unrealized_profit_loss_account_columns = [
 		(account + ":Currency/currency:120") for account in unrealized_profit_loss_accounts
 	]
-
-	for account in tax_accounts:
-		if account not in expense_accounts:
-			tax_columns.append(account + ":Currency/currency:120")
+	tax_columns = [
+		(account + ":Currency/currency:120")
+		for account in tax_accounts
+		if account not in expense_accounts
+	]
 
 	columns = (
 		columns
diff --git a/erpnext/selling/doctype/customer/customer.py b/erpnext/selling/doctype/customer/customer.py
index 2e5cbb80cb61..8889a5f939af 100644
--- a/erpnext/selling/doctype/customer/customer.py
+++ b/erpnext/selling/doctype/customer/customer.py
@@ -100,7 +100,8 @@ def validate(self):
 	@frappe.whitelist()
 	def get_customer_group_details(self):
 		doc = frappe.get_doc("Customer Group", self.customer_group)
-		self.accounts = self.credit_limits = []
+		self.accounts = []
+		self.credit_limits = []
 		self.payment_terms = self.default_price_list = ""
 
 		tables = [["accounts", "account"], ["credit_limits", "credit_limit"]]
diff --git a/erpnext/selling/doctype/customer/test_customer.py b/erpnext/selling/doctype/customer/test_customer.py
index 4979b8f976a7..f631a6ef5684 100644
--- a/erpnext/selling/doctype/customer/test_customer.py
+++ b/erpnext/selling/doctype/customer/test_customer.py
@@ -47,7 +47,8 @@ def test_get_customer_group_details(self):
 		c_doc.customer_name = "Testing Customer"
 		c_doc.customer_group = "_Testing Customer Group"
 		c_doc.payment_terms = c_doc.default_price_list = ""
-		c_doc.accounts = c_doc.credit_limits = []
+		c_doc.accounts = []
+		c_doc.credit_limits = []
 		c_doc.insert()
 		c_doc.get_customer_group_details()
 		self.assertEqual(c_doc.payment_terms, "_Test Payment Term Template 3")