diff --git a/doc/Changelog b/doc/Changelog
index ff0f765e4..8e168dc04 100644
--- a/doc/Changelog
+++ b/doc/Changelog
@@ -5,6 +5,7 @@
 	  ub_resolve_event – the cfglock is held when libworker_create is
 	  called.  This ends up trying to acquire the lock again in
 	  context_obtain_alloc in the call chain.
+	- Fix #528: if very high logging (4 or more) segfault on allow_snoop.
 
 26 Sep 2013: Wouter
 	- unbound-event.h is installed if configured --with-libevent.  It
diff --git a/iterator/iterator.c b/iterator/iterator.c
index 160489331..3c9804926 100644
--- a/iterator/iterator.c
+++ b/iterator/iterator.c
@@ -1212,7 +1212,7 @@ processInitRequest3(struct module_qstate* qstate, struct iter_qstate* iq,
 	 * cached referral as the response. */
 	if(!(qstate->query_flags & BIT_RD)) {
 		iq->response = iq->deleg_msg;
-		if(verbosity >= VERB_ALGO)
+		if(verbosity >= VERB_ALGO && iq->response)
 			log_dns_msg("no RD requested, using delegation msg", 
 				&iq->response->qinfo, iq->response->rep);
 		if(qstate->reply_origin)