From f1b35194f497f53547d3616146282b27c6a5f2ef Mon Sep 17 00:00:00 2001
From: "zainnadeem(RedOpsCell)" <zainnadeemzainnadeem80@gmail.com>
Date: Thu, 25 Jun 2026 12:25:00 +0500
Subject: [PATCH] gh-151763: Avoid unicode singleton check on NULL data

---
 Objects/unicodeobject.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/Objects/unicodeobject.c b/Objects/unicodeobject.c
index 3c689761de9b199..3e7a54afcd98292 100644
--- a/Objects/unicodeobject.c
+++ b/Objects/unicodeobject.c
@@ -1720,6 +1720,9 @@ unicode_is_singleton(PyObject *unicode)
 
     PyASCIIObject *ascii = _PyASCIIObject_CAST(unicode);
     if (ascii->length == 1) {
+        if (!PyUnicode_IS_COMPACT(unicode) && _PyUnicode_DATA_ANY(unicode) == NULL) {
+            return 0;
+        }
         Py_UCS4 ch = PyUnicode_READ_CHAR(unicode, 0);
         if (ch < 256 && LATIN1(ch) == unicode) {
             return 1;