little: make coverity understand

diff --git a/src/knot/zone/zone-tree.c b/src/knot/zone/zone-tree.c
index 3591d33d7e6f844ab3a2a32735d364d7aaedb92f..3255ebff67db4da50e8dd4d26be5bc19f2b06474 100644 (file)
--- a/src/knot/zone/zone-tree.c
+++ b/src/knot/zone/zone-tree.c
@@ -301,7 +301,7 @@ int zone_tree_it_double_begin(zone_tree_t *first, zone_tree_t *second, zone_tree
 
 bool zone_tree_it_finished(zone_tree_it_t *it)
 {
-       return it->it == NULL || trie_it_finished(it->it);
+       return it->it == NULL || it->tree == NULL || trie_it_finished(it->it);
 }
 
 zone_node_t *zone_tree_it_val(zone_tree_it_t *it)