diff --git a/src/list.c b/src/list.c
index d1494c6..ce1ccaa 100644
--- a/src/list.c
+++ b/src/list.c
@@ -415,6 +415,10 @@
 
     CHECK_LIST_MATERIALIZE(l);
 
+    // range_list_materialize may reset l->lv_len
+    if (n >= l->lv_len)
+	return NULL;
+
     // When there is a cached index may start search from there.
     if (l->lv_u.mat.lv_idx_item != NULL)
     {