Some images are not showing up.

For the people who show this error the description that displays indicates that data is coming from a disambiguation page, meaning that there are multiple people with this name on Wikipedia with pages.

I handled it this way:

function generateHTML(data) {
  console.log(data);
  const section = document.createElement('section');
  peopleList.appendChild(section);
  if (data.type === "standard"){
    section.innerHTML = `
      <img src=${data.thumbnail.source}></img>
      <h2>${data.title}</h2>
      <p>${data.description}</p>
      <p>${data.extract}</p>
    `;
  } else {
    section.innerHTML = `<h2>${data.title}</h2>`;
  }
}

This shows only the person's name when the type is "disambiguation" and the full profile when the type is "standard".

I then thought it is possible to select the correct person's name from the list of people the disambiguation page provides by using a regex to search for astronaut, cosmonaut, or taikonaut following the name inside <li> tags, grab what's inside the <li> tags, slice before the comma, and concatenate this to the wikiURL. However, this approach relies on the correct name having one of these keywords, which may depend on the editors of a particular disambiguation page. This may not be true in all cases so I didn't bother to build it.

Nice solution Ian! This helped me-I had two folks showing up and a blank spot with no picture or anything. Now I have a name there instead-think as people have mentioned this issue has to do with the API. No errors for me either :)