undefined error

Hi
I’m getting non indexing reports from google search console with some of them being ‘Alternative page with proper canonical tag’, one of the pages listed is a results page ‘https://yachtsandproperty.com/yachts-and-real-estate-sales-and-rentals/?type=real-estate&category=projects-investments&sort=price’, this is the results of a search of listing types on the a page of mine called ‘Explore Yachts & Property’
When I go to ‘Instant Indexing google update’ this url is listed ‘https://yachtsandproperty.com/yachts-and-real-estate-sales-and-rentals/’
but I have an ‘Error undefined’. The raw results are
4:32:05 PM update: https://yachtsandproperty.com/yachts-and-real-estate-sales-and-rentals/
{
“readyState”: 4,
“responseText”: “<p>There has been a critical error on this website.</p><p>Learn more about troubleshooting WordPress.</p>”,
“status”: 500,
“statusText”: “error”
}
——————————————————–

Can you help?