@slicer
Thanks, it is pretty hard bug and you will not be able to fix it (probably).
Go to file:
oc-content/plugins/attributes/functions.php
Find code:
$html .= '<option value="' . $c['pk_i_id'] . '">' . atr_name($s['locales']) . '</option>';
Replace it with:
$html .= '<option value="' . $c['pk_i_id'] . '">' . atr_name($c['locales']) . '</option>';
(so you change $s into $c).