Any idea why wp_insert_post is succeeding but not returning?

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I have a genuine mystery. With this code (in an ajax call):

file_put_contents(ABSPATH.'wp-content/debug.log', 'Inserting new note'  . PHP_EOL, FILE_APPEND);
        $post_id = wp_insert_post( array(
            'post_title'    => sanitize_text_field( $title ),
            'post_status'   =>  'publish',
            'post_type'     => 'coursenote',
            'post_content'  => $_POST['data']['body']
        ), true );
        file_put_contents(ABSPATH.'wp-content/debug.log', 'WTF'  . PHP_EOL, FILE_APPEND);

I am seeing the new post in the database, but the wp_insert_post function is somehow not returning (evidenced by fact that second file_put_contents is not doing anything.

I don’t know if it has to do with other ajax calls or something. Just really odd that everything is fine til wp_insert_post’s return.

Can anyone think of a reason why this could happen?

thanks,
Brian

Edit:

So I found the problem. Some really awful programmer had an exit; call in a save_post hook in a plugin. That resulted in the script not returning to the calling script (wp_insert_post).

That awful programmer is the author of this question 🙂 And the offensive exit is now a return

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