Fatal error when publishing a blog post – didi-lite

I have already posted this issue on Gutenberg GitHub, so I just copy it and report their answer, which seems to be helpful.

Problem description:
Using Gutenberg to create a blog post results in a fatal error.

• Gutenberg fails to publish a blog post and end up ‘hanging’
• However, the article seems to be partially published, as it can be reached from this page (second article from above): http://www.genialcontent.com/blog/
• But as soon as you click on the article’s individual url you get a new page with this error message:
  Fatal error: Call to undefined function lite_continue_reading_link() in /home/ge00002/www/wp-content/themes/didi-lite/functions.php on line 294

Answer from Gutenberg contributor and offered solution
This is a problem in the theme’s functions.php file.

function didi_lite_custom_excerpt_more( $output ) {
if ( has_excerpt() && ! is_attachment() ) {
$output .= didi-lite_continue_reading_link();
}
return $output;
}
It should be didi_lite_continue_reading_link()

The page I need help with: [log in to see the link]