I ran into this issue myself.
It's pretty easy to fix this rewrite error. You need to change 2 lines:
In: modules/phsimpleblog/phsimpleblog.php -> hookModuleRoutes
'module-ph_simpleblog-single' => array(
'controller' => 'single',
'rule' => $blog_slug.'/{sb_category}/{rewrite}',
'keywords' => array(
'sb_category' => array('regexp' => '[_a-zA-Z0-9-\pL]*', 'param' => 'sb_category'),
'rewrite' => array('regexp' => '[_a-zA-Z0-9-\pL]*', 'param' => 'sb_rewrite'), //<--- change 'rewrite' to 'sb_rewrite'
//'rewrite' => array('regexp' => '[_a-zA-Z0-9-\pL]*', 'param' => 'rewrite'),
),
'params' => array(
'fc' => 'module',
'module' => 'ph_simpleblog',
),
),
In: modules/ph_simpleblog/controllers/front/single.php -> init
$simpleblog_post_rewrite = Tools::getValue('sb_rewrite', 0); //<--- change 'rewrite' to 'sb_rewrite'
//$simpleblog_post_rewrite = Tools::getValue('rewrite', 0);
Thats it :)