diff --git a/CHANGELOG.md b/CHANGELOG.md
index 923729dfa..9fe7f97fc 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -2,6 +2,7 @@
 
 - Improved fix_invoice_item task
 - Fix a bug: cryptic error message when failed to create a manager
+- Fix a bug: unable to restore accounting periods closed by a deleted admin
 
 ## v5.6.1 2023 January 6
 
diff --git a/app/models/accounting_period.rb b/app/models/accounting_period.rb
index 39746142f..2d62d2703 100644
--- a/app/models/accounting_period.rb
+++ b/app/models/accounting_period.rb
@@ -12,7 +12,7 @@ class AccountingPeriod < ApplicationRecord
   before_create :compute_totals
   after_commit :archive_closed_data, on: [:create]
 
-  validates :start_at, :end_at, :closed_at, :closed_by, presence: true
+  validates :start_at, :end_at, :closed_at, presence: true
   validates_with DateRangeValidator
   validates_with DurationValidator
   validates_with PastPeriodValidator