Errors on save, but the slider works well

HI!

Getting such errors each time I save a testimonial or slider with wp debug enabled:

Notice: Undefined offset: 0 in /home/***/public_html/***/wp-includes/capabilities.php on line 127

Warning: Cannot modify header information – headers already sent by (output started at /home/***/public_html/***/wp-includes/capabilities.php:127) in /home/***/public_html/***/wp-includes/pluggable.php on line 1210

It’s php7, https://visualcomposer.io/visual-composer-starter-theme/ (child theme), shortcode added via https://visualcomposer.io/article/shortcode-element/

I’ve also noticed there are blog categories inside testimonials menu, posts categories shouldn’t be there, no?

Please advise.
Thanks.

• This topic was modified 7 years ago by Webprom Design.