diff --git a/app/services/activitypub/process_account_service.rb b/app/services/activitypub/process_account_service.rb
index 476dabdd77..61a2d2e9d1 100644
--- a/app/services/activitypub/process_account_service.rb
+++ b/app/services/activitypub/process_account_service.rb
@@ -21,6 +21,8 @@ class ActivityPub::ProcessAccountService < BaseService
     @domain      = TagManager.instance.normalize_domain(domain)
     @collections = {}
 
+    return unless valid_account?
+
     # The key does not need to be unguessable, it just needs to be somewhat unique
     @options[:request_id] ||= "#{Time.now.utc.to_i}-#{username}@#{domain}"
 
@@ -123,6 +125,12 @@ class ActivityPub::ProcessAccountService < BaseService
     @account.settings                = other_settings
   end
 
+  def valid_account?
+    display_name = @json['name']
+    note = @json['summary']
+    !Admin::NgWord.reject?(display_name) && !Admin::NgWord.reject?(note)
+  end
+
   def set_fetchable_key!
     @account.public_key = public_key || ''
   end