wp_insert_post not returning post ID? [closed]

I’ve had a read of the existing posts on here and still can’t see why my instance is doing this, but I’m using wp_insert_post to add a post with some data it’s given, and it’s inserting the post just fine but the function is returning 0 in place of the post ID – does it have to be triggered to use this?

    $ember_prepare_post = array(
    'post_author' => $ember_current_user_id,
    'post_category' => $ember_post_category,
    'post_content' => $ember_post_content,
    'post_title' => $ember_post_title,
    'post_status' => 'publish',
    'post_excerpt' => $ember_post_excerpt,
    'tags_input' => $ember_post_tags
    );

// now we've prepared an array with the data, we're going to save it into the WP database and obtain the resulting post ID.

$ember_newpost_id = wp_insert_post($ember_prepare_post, true);

I’m not seeing any errors, and have had a read of the wp_insert_post function itself and cannot see why it wouldn’t work. The ID’s of the posts it creates definitely aren’t zero, either.

Thanks!