Could not find Parent Account : v11.1.47 (master) Frappe Framework: v11.1.42 (master)

Hi, I encounterd the problem of “Could not find Parent Account” which seemed to be resolved with update ERPNext: v10.0.23 (master) and Frappe, Framework: v10.0.25 (master). The subject was closed FEB 20, '18.

However, with the current version, v11.1.47 (master) Frappe Framework: v11.1.42 (master), the same error arrises?

What to do? Apply fix frappe #12255?
“[fix] if is_root is true make parent account empty (frappe#12255)”

Your support is highly appreciated.