https://git.ruby-lang.org/ruby.git/commit/?id=257007af9a

From 257007af9aa4b04a28e995ed965b3d8e8d5879ec Mon Sep 17 00:00:00 2001
From: Nobuyoshi Nakada <nobu@r...>
Date: Thu, 1 Oct 2020 13:45:50 +0900
Subject: Added a fallback return


diff --git a/scheduler.c b/scheduler.c
index 03caec8..d7e713a 100644
--- a/scheduler.c
+++ b/scheduler.c
@@ -43,6 +43,8 @@ rb_scheduler_close(VALUE scheduler) https://github.com/ruby/ruby/blob/trunk/scheduler.c#L43
     if (rb_respond_to(scheduler, id_close)) {
         return rb_funcall(scheduler, id_close, 0);
     }
+
+    return Qnil;
 }
 
 VALUE
-- 
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