diff --git a/src/vty/command.c b/src/vty/command.c
index 2a8942d..d7b8026 100644
--- a/src/vty/command.c
+++ b/src/vty/command.c
@@ -1092,6 +1092,7 @@
 static vector cmd_node_vector(vector v, enum node_type ntype)
 {
 	struct cmd_node *cnode = vector_slot(v, ntype);
+	OSMO_ASSERT(cnode != NULL);
 	return cnode->cmd_vector;
 }