Fix `Ractor.make_shareable` for recursive structures with unfreezable components

Followup to #3823

1 files changed, 1 insertions, 1 deletions

diff --git a/ractor.c b/ractor.c
index 9a09312cf2..6b46d4ba95 100644
--- a/ractor.c
+++ b/ractor.c
@@ -2089,7 +2089,7 @@ rb_ractor_make_shareable(VALUE obj)
 {
     rb_obj_traverse(obj,
                     make_shareable_check_shareable,
-                    mark_shareable, mark_shareable);
+                    null_leave, mark_shareable);
     return obj;
 }