diff --git a/package/mac80211/patches/550-ath9k_fix_wep_adhoc_crash.patch b/package/mac80211/patches/550-ath9k_fix_wep_adhoc_crash.patch
new file mode 100644
index 000000000..a71db0440
--- /dev/null
+++ b/package/mac80211/patches/550-ath9k_fix_wep_adhoc_crash.patch
@@ -0,0 +1,13 @@
+--- a/drivers/net/wireless/ath/ath9k/common.c
++++ b/drivers/net/wireless/ath/ath9k/common.c
+@@ -319,6 +319,10 @@ int ath9k_cmn_key_config(struct ath_comm
+ 			idx = ath_reserve_key_cache_slot(common, key->alg);
+ 			break;
+ 		case NL80211_IFTYPE_ADHOC:
++			if (!sta) {
++				idx = key->keyidx;
++				break;
++			}
+ 			memcpy(gmac, sta->addr, ETH_ALEN);
+ 			gmac[0] |= 0x01;
+ 			mac = gmac;