In Last Christmas, isn't there still one dream crab left alive at the end?

In Last Christmas, most of the characters eventually woke up for real (I assume) and thereby killed the dream crabs that were attached to them. But Professor Albert died in the dream, so the real-world dream crab that was on him should still be alive.

I guess the Doctor might be tracking down that crab off-camera before series 9 starts, but considering he forgot who those four people were even during the course of that episode, it seems unlikely he'd remember enough information to locate Albert and his crab in the real world.

So is there still a dream crab running around on Earth that everyone simply forgot about?