diff --git a/include/net/timewait_sock.h b/include/net/timewait_sock.h
index be293d7..d7a306e 100644
--- a/include/net/timewait_sock.h
+++ b/include/net/timewait_sock.h
@@ -31,6 +31,9 @@
 
 static inline void twsk_destructor(struct sock *sk)
 {
+	BUG_ON(sk == NULL);
+	BUG_ON(sk->sk_prot == NULL);
+	BUG_ON(sk->sk_prot->twsk_prot == NULL);
 	if (sk->sk_prot->twsk_prot->twsk_destructor != NULL)
 		sk->sk_prot->twsk_prot->twsk_destructor(sk);
 }