Bug when profile fields are set to be hidden

When viewing the information at "My account" page (non-english version), below error occurs:
"warning: Invalid argument supplied for foreach() in /var/www/html/modules/user/user.module on line 662."

I guess it is because my profile fields are set to be hidden. It was solved after I added below "if" condition to i18nprofile_profile_alter().

if (isset($fields[$category])) {
$fields[$translation] = $fields[$category];
unset($fields[$category]);
}