mp_version missing from mp_settings array, why?

[23-Apr-2012 13:44:46] PHP Notice: Undefined index: mp_version in /home/markitek/public_html/palmatin/wp-content/plugins/marketpress/marketpress.php on line 154

Was getting annoyed at the mp_version warning while I’m debugging some other stuff and took a look. For some reason my MarketPress, initially installed from somewhere around 2.4.x, didn’t have mp_version stored in mp_settings. Also no amount of saving settings would create it. OTOH it does have an mp_version entry directly in wp_options table.

Maybe Aaron has an idea how this can get desynced? I think the logic around L154 could be improved a bit for this case.