+++ /dev/null
---- a/ath/if_ath.c
-+++ b/ath/if_ath.c
-@@ -4925,7 +4925,7 @@ ath_beacon_generate(struct ath_softc *sc
- * capability info and arrange for a mode change
- * if needed.
- */
-- if (sc->sc_dturbo) {
-+ if (sc->sc_dturbo && NULL != avp->av_boff.bo_tim) {
- u_int8_t dtim;
- dtim = ((avp->av_boff.bo_tim[2] == 1) ||
- (avp->av_boff.bo_tim[3] == 1));