Bench rebuild-global-index fails on single tables

File “…frappe-bench/apps/frappe/frappe/database/database.py”, line 864, in get_table_columns
raise self.TableMissingError(‘DocType’, doctype)
pymysql.err.ProgrammingError: (‘DocType’, ‘Quick Stock Balance’)

This table is a single and thus has no own database table. Is this a bug? Running in frappe & erpnext 12 dev