From cde283d16d87024f455e45c6f1b4e4f7d8905836 Mon Sep 17 00:00:00 2001
From: Victor Stinner <vstinner@python.org>
Date: Wed, 24 Jun 2020 03:21:15 +0200
Subject: [PATCH] bpo-40521: Fix _PyContext_Fini() (GH-21103)

Only clear _token_missing in the main interpreter.
---
 Python/context.c | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/Python/context.c b/Python/context.c
index dc340718847..15d8b8ea4b9 100644
--- a/Python/context.c
+++ b/Python/context.c
@@ -1302,7 +1302,9 @@ _PyContext_ClearFreeList(PyThreadState *tstate)
 void
 _PyContext_Fini(PyThreadState *tstate)
 {
-    Py_CLEAR(_token_missing);
+    if (_Py_IsMainInterpreter(tstate)) {
+        Py_CLEAR(_token_missing);
+    }
     _PyContext_ClearFreeList(tstate);
 #ifdef Py_DEBUG
     struct _Py_context_state *state = &tstate->interp->context;