PHP errors

The following error produces PHP warnings in debug mode:

file: gotowp_personal.php
function: gotowp_has_shortcode
line: 891

This code can be called on pages without $post content, such as 404 pages which have sidebars that use post data. As such, line 891:

if( has_shortcode( $post->post_content, $shortcode) )

will create a notice for the missing object $post.

fix: Add this code after line 888:

if ( empty($post) ) return $found;

—

In addition, it looks like the custom function you include at line 908, gotowp_custom_has_shortcode is missing the parameter in the function declaration:

function gotowp_custom_has_shortcode(){

Should be:

function gotowp_custom_has_shortcode( $shortcode ){

https://wordpress.org/plugins/gotowp/