Snap for 9905984 from 938c7a66884155a90973b9923cab4172a3e15256 to udc-release

Change-Id: Ib49bfb5a9d01349c54f40707f8dab6c957e51ca5
diff --git a/wmediumd/wmediumd.c b/wmediumd/wmediumd.c
index ac2723a..2b1e9a4 100644
--- a/wmediumd/wmediumd.c
+++ b/wmediumd/wmediumd.c
@@ -834,7 +834,7 @@
 			if (memcmp(src, station->addr, ETH_ALEN) == 0)
 				continue;
 
-			if (is_multicast_ether_addr(dest)) {
+			if (is_multicast_ether_addr(dest) && station->client != NULL) {
 				int snr, rate_idx, signal;
 				double error_prob;