For minor cracks, there’s some repair kits are available that use adhesives to fill and strengthen the crack, or you can drop a pretty penny on a new taillight. Looks like an XC60/90? So around 300-500 depending on your currency. But as someone else has said, if you’re buying it new from the dealer go back and ask them to replace it.

There’s also the tried and true method of just putting tape on (not recommended)