diff --git a/lib/ns/query.c b/lib/ns/query.c
index 537d332a56..be4cbb6b8f 100644
--- a/lib/ns/query.c
+++ b/lib/ns/query.c
@@ -5325,6 +5325,7 @@ qctx_freedata(query_ctx_t *qctx) {
 		ns_client_releasename(qctx->client, &qctx->zfname);
 		dns_db_detachnode(qctx->zdb, &qctx->znode);
 		dns_db_detach(&qctx->zdb);
+		qctx->zversion = NULL;
 	}
 
 	if (qctx->event != NULL && !qctx->client->nodetach) {