fix: Ignore missing customer group while fetching price list

erpnext/accounts/party.py

@@ -151,7 +151,7 @@ def set_contact_details(party_details, party, party_type):
 
 def set_other_values(party_details, party, party_type):
 	# copy
-	if party_type=="Customer":
+	if party_type == "Customer":
 		to_copy = ["customer_name", "customer_group", "territory", "language"]
 	else:
 		to_copy = ["supplier_name", "supplier_group", "language"]
@@ -170,12 +170,11 @@ def get_default_price_list(party):
 		return party.default_price_list
 
 	if party.doctype == "Customer":
-		price_list =  frappe.get_cached_value("Customer Group",
-			party.customer_group, "default_price_list")
-		if price_list:
-			return price_list
+		try:
+			return frappe.get_cached_value("Customer Group", party.customer_group, "default_price_list")
+		except frappe.exceptions.DoesNotExistError:
+			return
 
-	return None
 
 def set_price_list(party_details, party, party_type, given_price_list, pos=None):
 	# price list

erpnext/accounts/test_party.py

@@ -0,0 +1,16 @@
+import frappe
+from frappe.tests.utils import FrappeTestCase
+
+from erpnext.accounts.party import get_default_price_list
+
+
+class PartyTestCase(FrappeTestCase):
+	def test_get_default_price_list_should_return_none_for_invalid_group(self):
+		customer = frappe.get_doc({
+			'doctype': 'Customer',
+			'customer_name': 'test customer',
+		}).insert(ignore_permissions=True, ignore_mandatory=True)
+		customer.customer_group = None
+		customer.save()
+		price_list = get_default_price_list(customer)
+		assert price_list is None