There's no response to run selected revisions about DBV.

When the SQL statement under revisions has an exception, such as deleting a nonexistent column, the foreground does not respond. In fact, there is a reaction, but the returned data is not JSON data, cannot be parsed by the front end, modify the public function query for the pdo.php file ($sql)

Public Function query ($sql)
{
return $this->_connection->query ($sql);
}

Modified to:
Public Function query ($sql)
{
try{
return $this->_connection->query ($sql);
}
catch (Exception $e) {
throw new Dbv_exception ($e->getmessage (), (int) $e->getcode ());
}
}

This bug took 1 whole night!

There's no response to run selected revisions about DBV.