does acf_save_post cause endless loop?

add_post_meta doesn’t call the same hook again but there are some other functions such as wp_update_post which call the hook again. In case it is going into infinite loop you’ll have to call remove_action inside the function to not make it recursive

Hata!: SQLSTATE[HY000] [1045] Access denied for user 'divattrend_liink'@'localhost' (using password: YES)