I think we fixed it on Skype/Discord.
If you have similar problem, you should edit
install.php, under (179 line):
PHP:
$SQL = Website::getDBHandle();
Add:
PHP:
Website::getDBHandle()->setPrintQueries(true);
Then website will print all queries send to database during installation. It will also print all errors with text messages what is wrong with query to database.
In this case it was missing 'comment' column in table 'players'.