diff -r f4e00bb3f3b2 -r 5c2af036103f src/tree.c
--- a/src/tree.c	Sat Oct 05 19:05:47 2024 +0200
+++ b/src/tree.c	Sun Oct 06 12:32:28 2024 +0200
@@ -812,6 +812,7 @@
     tree->node_create = create_func;
     tree->search = search_func;
     tree->search_data = search_data_func;
+    tree->simple_destructor = NULL;
     tree->advanced_destructor = (cx_destructor_func2) cxFree;
     tree->destructor_data = (void *) allocator;
     tree->loc_parent = loc_parent;