Cannot create a swarm id, always fails with pq error

$ docker run swarm create
Unable to find image ‘swarm:latest’ locally
latest: Pulling from library/swarm
2bc79aec8ea0: Pull complete
dc2fb86a875a: Pull complete
435e648d0f23: Pull complete
e16042a92d05: Pull complete
045bd7b00b5b: Pull complete
3caea1253d76: Pull complete
2b4c55187a27: Pull complete
6b40fe7724bd: Pull complete
Digest: sha256:51a30269d3f3aaa04f744280e3c118aea032f6df85b49819aee29d379ac313b5
Status: Downloaded newer image for swarm:latest
pq: remaining connection slots are reserved for non-replication superuser connections

Searching for the error on Google isn’t helping. Though it doesn’t look like many people read these forums, or that many are using Swarm, I’m hoping someone might have an idea of where to start or what to fix?