diff --git a/net/ieee802154/6lowpan.c b/net/ieee802154/6lowpan.c
index 6871ec1..416a54d 100644
--- a/net/ieee802154/6lowpan.c
+++ b/net/ieee802154/6lowpan.c
@@ -314,6 +314,9 @@
 	struct udphdr *uh = udp_hdr(skb);
 	u8 tmp;
 
+	if (!uh)
+		goto err;
+
 	if (lowpan_fetch_skb_u8(skb, &tmp))
 		goto err;