Can't initialize submodules

[quicklisp]

When I try to do this:

git submodule update --init --recursive

I get this:

Submodule 'vendor/cffi' () registered for path 'vendor/cffi'
Submodule 'vendor/cl-ev' () registered for path 'vendor/cl-ev'
Submodule 'vendor/lisp-zmq' () registered for path 'vendor/lisp-zmq'
fatal: Needed a single revision
Unable to find current revision in submodule path 'vendor/cffi'

What should I do?

[quicklisp]

I'm afraid I have to drop hinge until this is resolved.