Don't try to add a non-existing node back to the node_udp_tree.

diff --git a/src/graph.c b/src/graph.c
index f6ce90d..491a59f 100644 (file)
--- a/src/graph.c
+++ b/src/graph.c
@@ -226,7 +226,9 @@ void sssp_bfs(void)
                                        free(e->to->hostname);
 
                                e->to->hostname = sockaddr2hostname(&e->to->address);
-                               avl_insert_node(node_udp_tree, node);
+
+                               if(node)
+                                       avl_insert_node(node_udp_tree, node);
 
                                if(e->to->options & OPTION_PMTU_DISCOVERY) {
                                        e->to->mtuprobes = 0;