config_list = (__GLcontextModes **)
GLX_PREFIX(glXGetFBConfigs)( dpy, screen, & list_size );
- if ( (config_list != NULL) && (list_size > 0) ) {
+ if ( (config_list != NULL) && (list_size > 0) && (attribList != NULL) ) {
list_size = choose_visual( config_list, list_size, attribList,
GL_TRUE );
if ( list_size == 0 ) {