https://git.ruby-lang.org/ruby.git/commit/?id=9f0c6f20c5

From 9f0c6f20c58067923864575b60af730d191b8f6c Mon Sep 17 00:00:00 2001
From: Peter Zhu <peter@p...>
Date: Thu, 2 Dec 2021 11:16:53 -0500
Subject: [Bug #18382] Fix crash in compaction for
 ObjectSpace.trace_object_allocations

ObjectSpace.trace_object_allocations can crash when auto-compaction is
enabled.
---
 ext/objspace/object_tracing.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/ext/objspace/object_tracing.c b/ext/objspace/object_tracing.c
index 4973a7535ba..66d6baa4911 100644
--- a/ext/objspace/object_tracing.c
+++ b/ext/objspace/object_tracing.c
@@ -208,7 +208,8 @@ allocation_info_tracer_compact(void *ptr) https://github.com/ruby/ruby/blob/trunk/ext/objspace/object_tracing.c#L208
 {
     struct traceobj_arg *trace_arg = (struct traceobj_arg *)ptr;
 
-    if (st_foreach_with_replace(trace_arg->object_table, hash_foreach_should_replace_key, hash_replace_key, 0)) {
+    if (trace_arg->object_table &&
+            st_foreach_with_replace(trace_arg->object_table, hash_foreach_should_replace_key, hash_replace_key, 0)) {
         rb_raise(rb_eRuntimeError, "hash modified during iteration");
     }
 }
-- 
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