From 44648a371445eaf42a19ef7418ae7438cc3b7286 Mon Sep 17 00:00:00 2001
From: Tim Conley <timothy.conley@temporal.io>
Date: Mon, 20 Oct 2025 09:40:08 -0700
Subject: [PATCH] Linecache source is unavailable for frozen modules when
 global modules is None

---
 Lib/linecache.py | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/Lib/linecache.py b/Lib/linecache.py
index ef73d1aa99774a..ef3b2d9136b4d2 100644
--- a/Lib/linecache.py
+++ b/Lib/linecache.py
@@ -123,9 +123,12 @@ def updatecache(filename, module_globals=None):
     if _source_unavailable(filename):
         return []
 
-    if filename.startswith('<frozen ') and module_globals is not None:
+    if filename.startswith('<frozen '):
         # This is a frozen module, so we need to use the filename
         # from the module globals.
+        if module_globals is None:
+            return []
+
         fullname = module_globals.get('__file__')
         if fullname is None:
             return []