https://git.ruby-lang.org/ruby.git/commit/?id=dd23e4658b

From dd23e4658b8587adf8d6fed96b574a979b169e46 Mon Sep 17 00:00:00 2001
From: Noah Gibbs <noah.gibbs@s...>
Date: Tue, 27 Jul 2021 16:54:45 +0100
Subject: If codeblock is NULL because YJIT is disabled, YJIT.runtime_stats
 should return Qnil

---
 yjit_iface.c | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/yjit_iface.c b/yjit_iface.c
index ff8c52c4b9..90b4ed9555 100644
--- a/yjit_iface.c
+++ b/yjit_iface.c
@@ -702,6 +702,11 @@ comments_for(rb_execution_context_t *ec, VALUE self, VALUE start_address, VALUE https://github.com/ruby/ruby/blob/trunk/yjit_iface.c#L702
 static VALUE
 get_yjit_stats(rb_execution_context_t *ec, VALUE self)
 {
+    // Return Qnil if YJIT isn't enabled
+    if (cb == NULL) {
+        return Qnil;
+    }
+
     VALUE hash = rb_hash_new();
 
     RB_VM_LOCK_ENTER();
-- 
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