diff --git a/erpnext/controllers/website_list_for_contact.py b/erpnext/controllers/website_list_for_contact.py
index 31578555e6cd23a645269bee5f571597dcba2c9f..59cf6f2decf0c491fd1baaa323121d6ea57c4f1a 100644
--- a/erpnext/controllers/website_list_for_contact.py
+++ b/erpnext/controllers/website_list_for_contact.py
@@ -301,6 +301,9 @@ def add_role_for_portal_user(portal_user, role):
 	user_doc = frappe.get_doc("User", portal_user.user)
 	roles = {r.role for r in user_doc.roles}
 
+	if user_doc.get("role_profile") or user_doc.get("role_profiles"):
+		return  # It's not possible to add the Customer role
+
 	if role in roles:
 		return
 
diff --git a/erpnext/portal/utils.py b/erpnext/portal/utils.py
index aed6cfb283c6943704127a59bf0e0d5ff19ccf19..1d74335854c9372cefdae393837c01c454365828 100644
--- a/erpnext/portal/utils.py
+++ b/erpnext/portal/utils.py
@@ -4,7 +4,10 @@ import frappe
 def set_default_role(doc, method):
 	"""Set customer, supplier, student, guardian based on email"""
 	if frappe.flags.setting_role or frappe.flags.in_migrate:
-		return
+		return  # Won't work in async task
+
+	if doc.get("role_profile") or doc.get("role_profiles"):
+		return  # It's not possible to add the Customer/Supplier role
 
 	roles = frappe.get_roles(doc.name)