Link related posts in Admin

Hi

After the caching post step, goes to 100% nothing happens tried multiple times, http://prntscr.com/na185v

No error in console as well.

PHP error
[10-Apr-2019 12:03:05 UTC] WordPress database error Duplicate entry ‘11837-phở’ for key ‘PRIMARY’ for query INSERT INTO wp_rp4wp_cache (post_id, word, weight, post_type ) VALUES ( 11837, ‘hanoi’, 0.139073, ‘post’ ),( 11837, ‘pho’, 0.113907, ‘post’ ),( 11837, ‘vietnam’, 0.034437, ‘post’ ),( 11837, ‘videos’, 0.026490, ‘post’ ),( 11837, ‘asia’, 0.026490, ‘post’ ),( 11837, ‘phở’, 0.007947, ‘post’ ) made by do_action(‘wp_ajax_rp4wp_install_save_words’), WP_Hook->do_action, WP_Hook->apply_filters, RP4WP_Hook_Ajax_Install_Save_Words->run, RP4WP_Related_Word_Manager->save_all_words, RP4WP_Related_Word_Manager->save_words_of_post