From 68d8bb94a3facf73cebdc93c64a5acbc110b1e46 Mon Sep 17 00:00:00 2001
From: Stan Ulbrych <stan@python.org>
Date: Thu, 11 Jun 2026 15:52:11 +0100
Subject: [PATCH] gh-151112: Fix crash in `compiler_mod()` when entering the
 current compilation unit fails (GH-151234) (cherry picked from commit
 937d89c4d9b7c5fda6730a1127db118d881d13cb)

Co-authored-by: Stan Ulbrych <stan@python.org>
---
 Python/compile.c | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/Python/compile.c b/Python/compile.c
index d79e4b44c2c02c..ab2e532e43e8d1 100644
--- a/Python/compile.c
+++ b/Python/compile.c
@@ -853,12 +853,15 @@ compiler_mod(compiler *c, mod_ty mod)
 {
     PyCodeObject *co = NULL;
     int addNone = mod->kind != Expression_kind;
+    assert(c->u == NULL);
     if (compiler_codegen(c, mod) < 0) {
         goto finally;
     }
     co = _PyCompile_OptimizeAndAssemble(c, addNone);
 finally:
-    _PyCompile_ExitScope(c);
+    if (c->u != NULL) {
+        _PyCompile_ExitScope(c);
+    }
     return co;
 }