--- a/net/mac80211/agg-tx.c
+++ b/net/mac80211/agg-tx.c
@@ -814,7 +814,7 @@ void ieee80211_process_addba_resp(struct
 		 * of at least 1.
 		 */
 		if (!buf_size)
-			goto out;
+			buf_size = 1;
 
 		if (test_and_set_bit(HT_AGG_STATE_RESPONSE_RECEIVED,
 				     &tid_tx->state)) {