From cb38aa40d5ea5129a0c61c3ec077657a7c441810 Mon Sep 17 00:00:00 2001
From: Locked-chess-official <13140752715@163.com>
Date: Mon, 30 Mar 2026 21:08:41 +0800
Subject: [PATCH 1/3] check type in _find_incompatible_extension_module and add
 try-except

---
 Lib/traceback.py | 37 ++++++++++++++++++++-----------------
 1 file changed, 20 insertions(+), 17 deletions(-)

diff --git a/Lib/traceback.py b/Lib/traceback.py
index 1f9f151ebf5d39..dcf2d04b0d3eee 100644
--- a/Lib/traceback.py
+++ b/Lib/traceback.py
@@ -1907,26 +1907,29 @@ def _find_incompatible_extension_module(module_name):
     import importlib.machinery
     import importlib.resources.readers
 
-    if not module_name or not importlib.machinery.EXTENSION_SUFFIXES:
+    if not isinstance(module_name, str) or not importlib.machinery.EXTENSION_SUFFIXES:
         return
 
     # We assume the last extension is untagged (eg. .so, .pyd)!
     # tests.test_traceback.MiscTest.test_find_incompatible_extension_modules
     # tests that assumption.
-    untagged_suffix = importlib.machinery.EXTENSION_SUFFIXES[-1]
-    # On Windows the debug tag is part of the module file stem, instead of the
-    # extension (eg. foo_d.pyd), so let's remove it and just look for .pyd.
-    if os.name == 'nt':
-        untagged_suffix = untagged_suffix.removeprefix('_d')
-
-    parent, _, child = module_name.rpartition('.')
-    if parent:
-        traversable = importlib.resources.files(parent)
-    else:
-        traversable = importlib.resources.readers.MultiplexedPath(
-            *map(pathlib.Path, filter(os.path.isdir, sys.path))
-        )
+    try:
+        untagged_suffix = importlib.machinery.EXTENSION_SUFFIXES[-1]
+        # On Windows the debug tag is part of the module file stem, instead of the
+        # extension (eg. foo_d.pyd), so let's remove it and just look for .pyd.
+        if os.name == 'nt':
+            untagged_suffix = untagged_suffix.removeprefix('_d')
+
+        parent, _, child = module_name.rpartition('.')
+        if parent:
+            traversable = importlib.resources.files(parent)
+        else:
+            traversable = importlib.resources.readers.MultiplexedPath(
+                *map(pathlib.Path, filter(os.path.isdir, sys.path))
+            )
 
-    for entry in traversable.iterdir():
-        if entry.name.startswith(child + '.') and entry.name.endswith(untagged_suffix):
-            return entry.name
+        for entry in traversable.iterdir():
+            if entry.name.startswith(child + '.') and entry.name.endswith(untagged_suffix):
+                return entry.name
+    except Exception:
+        return

From 9aa6631a580dfc948ed731148caffbabbecaef19 Mon Sep 17 00:00:00 2001
From: Locked-chess-official <13140752715@163.com>
Date: Mon, 30 Mar 2026 21:11:13 +0800
Subject: [PATCH 2/3] add news

---
 .../next/Library/2026-03-30-21-11-02.gh-issue-146632.cDa6Yp.rst  | 1 +
 1 file changed, 1 insertion(+)
 create mode 100644 Misc/NEWS.d/next/Library/2026-03-30-21-11-02.gh-issue-146632.cDa6Yp.rst

diff --git a/Misc/NEWS.d/next/Library/2026-03-30-21-11-02.gh-issue-146632.cDa6Yp.rst b/Misc/NEWS.d/next/Library/2026-03-30-21-11-02.gh-issue-146632.cDa6Yp.rst
new file mode 100644
index 00000000000000..5a959efe1695dd
--- /dev/null
+++ b/Misc/NEWS.d/next/Library/2026-03-30-21-11-02.gh-issue-146632.cDa6Yp.rst
@@ -0,0 +1 @@
+Add type check and use try-except to fix traceback crash

From f0aec1f29611950c573733b6961527edb9e7df5b Mon Sep 17 00:00:00 2001
From: Locked-chess-official <13140752715@163.com>
Date: Tue, 31 Mar 2026 00:03:57 +0800
Subject: [PATCH 3/3] add a test on wrong name in ModuleNotFoundError

---
 Lib/test/test_traceback.py | 12 ++++++++++++
 1 file changed, 12 insertions(+)

diff --git a/Lib/test/test_traceback.py b/Lib/test/test_traceback.py
index 5dc11253e0d5c8..d9e1c0bb3069de 100644
--- a/Lib/test/test_traceback.py
+++ b/Lib/test/test_traceback.py
@@ -5456,5 +5456,17 @@ def test_suggestion_still_works_for_non_lazy_attributes(self):
         self.assertNotIn(b"BAR_MODULE_LOADED", stdout)
 
 
+class TestNoCrashInTracebackException(unittest.TestCase):
+    def test_module_not_found_error_with_bad_name(self):
+        exc = ModuleNotFoundError(name=NotImplemented)
+        try:
+            te = traceback.TracebackException.from_exception(exc)
+        except Exception as e:
+            self.fail(f"TracebackException raised unexpected exception: {e!r}")
+        else:
+            msg = "".join(te.format())
+            self.assertEqual(msg, "ModuleNotFoundError\n")
+
+
 if __name__ == "__main__":
     unittest.main()