What steps will reproduce the problem?
sdl:push-user-event causes 
"The value NIL is not of type SB-SYS:SYSTEM-AREA-POINTER." in most cases.

What is the expected output? What do you see instead?


What version of the product are you using? On what operating system?

Windows7 x86-64 / sbcl-1.1.0.36-x86 / lispbuilder-20110619-svn / cffi 0.10.6

Please provide any additional information below.

Using (cffi:null-pointer) by default in data1/data2 works for me.
(defun push-user-event (&key (code 0) (data1 (cffi:null-pointer)) (data2 
(cffi:null-pointer)))