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-rw-r--r--app/validators/existing_username_validator.rb2
1 files changed, 1 insertions, 1 deletions
diff --git a/app/validators/existing_username_validator.rb b/app/validators/existing_username_validator.rb
index b31d09827..723302ec9 100644
--- a/app/validators/existing_username_validator.rb
+++ b/app/validators/existing_username_validator.rb
@@ -5,7 +5,7 @@ class ExistingUsernameValidator < ActiveModel::EachValidator
     return if value.blank?
 
     if options[:multiple]
-      missing_usernames = value.split(',').map { |username| username.strip.gsub(/\A@/, '') }.map { |username| username unless Account.find_local(username) }.compact
+      missing_usernames = value.split(',').map { |username| username.strip.gsub(/\A@/, '') }.filter_map { |username| username unless Account.find_local(username) }
       record.errors.add(attribute, I18n.t('existing_username_validator.not_found_multiple', usernames: missing_usernames.join(', '))) if missing_usernames.any?
     else
       record.errors.add(attribute, I18n.t('existing_username_validator.not_found')) unless Account.find_local(value.strip.gsub(/\A@/, ''))