}
/* add interfaces */
+--- a/drivers/net/wireless/ath/ath9k/xmit.c
++++ b/drivers/net/wireless/ath/ath9k/xmit.c
+@@ -1745,7 +1745,10 @@ int ath_tx_start(struct ieee80211_hw *hw
+ int frmlen = skb->len + FCS_LEN;
+ int q;
+
+- txctl->an = (struct ath_node *)sta->drv_priv;
++ /* NOTE: sta can be NULL according to net/mac80211.h */
++ if (sta)
++ txctl->an = (struct ath_node *)sta->drv_priv;
++
+ if (info->control.hw_key)
+ frmlen += info->control.hw_key->icv_len;
+