Because the checkbox is visible when merge plugin is disable, i've changed :
in post.php, line 749
if ($is_admmod && !$fid)
by
if ($is_admmod && !$fid && isset($pun_config['o_merge_timeout']) && $pun_config['o_merge_timeout']>0)
in viewtopic.phop, line 714
if ($is_admmod)
by
if ($is_admmod && isset($pun_config['o_merge_timeout']) && $pun_config['o_merge_timeout']>0)
Because the checkbox is visible when merge plugin is disable, i've changed :
in post.php, line 749
if ($is_admmod && !$fid)
byif ($is_admmod && !$fid && isset($pun_config['o_merge_timeout']) && $pun_config['o_merge_timeout']>0)
in viewtopic.phop, line 714
if ($is_admmod)
byif ($is_admmod && isset($pun_config['o_merge_timeout']) && $pun_config['o_merge_timeout']>0)
Best regard