I had to correct line from

foreach ($archivedTableSettingsArray as $archivedTableSetting) {
if ($archivedTableSetting === 'unknown') {
$tokenencryptionoptions = $tokenencryptionoptionsOld;
}
}

to

foreach ((array) $archivedTableSettingsArray as $archivedTableSetting) {
if ($archivedTableSetting === 'unknown') {
$tokenencryptionoptions = $tokenencryptionoptionsOld;
}
}

I don't know if the solution is right or there is a problem regarding the array itself.