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--- a/ath/if_ath.c +++ b/ath/if_ath.c @@ -4925,7 +4925,7 @@ * 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));