In the file blocks/progress/lib.php inside the get_monitorable_modules method the hotpot collumn, just after the WHERE clause, must be hotpotid instead.

Steps:
1. Create a course and a hotpotatoes activity.
2. Configure the progress bar to start monitoring hotpotatoes activity.
3. try to enter in the course again. It is expected to see the error messagem "Error reading database"

Possible fix:

Locate :

'attempted' => "SELECT id
FROM

{hotpot_attempts}
WHERE hotpot = :eventid
AND userid = :userid",
'finished' => "SELECT id
FROM {hotpot_attempts}

WHERE hotpot = :eventid
AND userid = :userid
AND timefinish <> 0",

Change to :

'attempted' => "SELECT id
FROM

{hotpot_attempts}
WHERE hotpotid = :eventid
AND userid = :userid",
'finished' => "SELECT id
FROM {hotpot_attempts}

WHERE hotpotid = :eventid
AND userid = :userid
AND timefinish <> 0",