_XGetXCBBuffer problem

[kpr]

My application crash sometimes with this error:

adclamp: ../../src/xcb_lock.c:77: _XGetXCBBuffer: Assertion `((int) ((xcb_req) - (dpy->request)) >= 0)' failed.

I've seen in some forums that could be a libraries problem, but i'm not sure. Any help?

ThankS