Executing Clojure in a code block results in a "Code block produced no output".

Any code. For example:

#+BEGIN_SRC clojure
(+ 1 1)
#+END_SRC


I am running CIDER 0.8.0alpha (package: 20141001.738) (Java 1.8.0_05, Clojure 1.6.0, nREPL 0.2.6)
Ob-clojure.el from master. 
Org-mode 8.2.7c

Thank you in advance.
--
Daniel Szmulewicz
daniel.szmulewicz@gmail.com