Yeah, this one's common. Those aren't cracks, they're small spots in the non-stick coating from contact.
It happens if you insert the basket at an angle—one side can scrape the wall of the pan and flake off tiny bits of the coating. Those fragments aren't harmful to health; all materials used are food-specific.
To prevent it: insert the basket straight into the pan correctly. Don't tilt it. Also, avoid using abrasive cleaning tools.
It's safe to keep using. Just be mindful when inserting the basket.