Pagination error [Fixed]

Hi author,

Thanks for your effort on this plugin. I just started using it, I need to use pagination for ads purposes. I found a bug in the code.

functions.php line 427
$next_page_data = $next_page_data.'page/'.$page_num.'?currentScore=';
When that line executes it doesn’t generate the correct URL because the get_the_permalink() doesn’t return the last forward slash (/) so $next_page_data renders to https://www.myurl.com/quizpage/2?currentScore

I replaced that line with the missing slash and now it works:
$next_page_data = $next_page_data.'/page/'.$page_num.'?currentScore=';