[Pravin Paratey]

look for these lines (20-23) in topic.php

if ( !$bb_db_override ) :

$posts = get_thread( $topic_id, $page );

$forum = get_forum ( $topic->forum_id );

change to

if ( !$bb_db_override ) :

$posts = get_thread( $topic_id, $page, 1 );

$forum = get_forum ( $topic->forum_id );

get_thread function changed