diff --git a/drivers/net/wireless/ath/ath9k/xmit.c b/drivers/net/wireless/ath/ath9k/xmit.c
index 834e6bc..eb22156 100644
--- a/drivers/net/wireless/ath/ath9k/xmit.c
+++ b/drivers/net/wireless/ath/ath9k/xmit.c
@@ -1875,6 +1875,12 @@ static void ath_tx_start_dma(struct ath_softc *sc, struct sk_buff *skb,
 			IEEE80211_QOS_CTL_TID_MASK;
 		tid = ATH_AN_2_TID(txctl->an, tidno);
 
+		if (!tid) {
+			printk("\ntid is NULL!!!");
+			return;
+		}
+
+
 		WARN_ON(tid->ac->txq != txctl->txq);
 	}