error in backend
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In the backend, when I click on “new post” I get these warnings:
https://www.fagufo.it/wp-content/uploads/2020/03/Screenshot-from-2020-03-31-21-41-32.png
The full text is:
Warning: Creating default object from empty value in /web/htdocs/www.fagufo.it/home/wp-content/plugins/wp-next-post-navi/wp-next-post-navi.php on line 58
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I digged a bit and found the error source. In wp-next-post-navi.php on lines 42 49 and 58 you directly use $next_post->sub as in:
$next_navigation = $next_post->sub=""?'':'Next Post Coming Soon...▶';This does not work for many reasons:
1) $next_post can be null, as per get_next_post() documentation: https://developer.ww.wp.xz.cn/reference/functions/get_next_post/2) you forgot a ! and so you are assigning a value
3) you should not use the fields of the $next_post object directly, since you are in the loop (with the exception of post id, that you can use). You should instead run the filters, as per this comment:
https://developer.ww.wp.xz.cn/reference/classes/wp_post/#comment-1971
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