diff --git a/frappe/core/doctype/user_type/user_type.py b/frappe/core/doctype/user_type/user_type.py
index b3965d9b84..b3e61610cc 100644
--- a/frappe/core/doctype/user_type/user_type.py
+++ b/frappe/core/doctype/user_type/user_type.py
@@ -114,7 +114,7 @@ class UserType(Document):
 		self.select_doctypes = []
 
 		select_doctypes = []
-		user_doctypes = tuple(row.document_type for row in self.user_doctypes)
+		user_doctypes = [row.document_type for row in self.user_doctypes]
 
 		for doctype in user_doctypes:
 			doc = frappe.get_meta(doctype)
@@ -267,4 +267,4 @@ def apply_permissions_for_non_standard_user_type(doc, method=None):
 				user_doc.update_children()
 				add_user_permission(doc.doctype, doc.name, doc.get(data[1]))
 			else:
-				frappe.db.set_value('User Permission', perm_data[0], 'user', doc.get(data[1]))
\ No newline at end of file
+				frappe.db.set_value('User Permission', perm_data[0], 'user', doc.get(data[1]))