Segfault when accessing request attributes

Hello! I am developing a module and I always get a segmentation fault when referencing request->packet->vps. My module runs after preprocess in the authorize section. Here is my code where I get the segfault (this is the first line in the module): VALUE_PAIR *vp = request->packet->vps; I am using Debian 4.0 with FreeRADIUS 1.1.3. Thank you for any suggestions in advance. Best regards, Gabor Bakonyi