From 7eab0d000cd12d76f90d4a80df1b728d3ff94728 Mon Sep 17 00:00:00 2001
From: Victor Stinner <victor.stinner@gmail.com>
Date: Mon, 15 Jul 2013 21:16:27 +0200
Subject: [PATCH] Issue #18408: Fix PyEval_EvalFrameEx() for MemoryError

Don't pass a NULL traceback to PyException_SetTraceback(): pass Py_None.
Passing NULL would raise a new exception.
---
 Python/ceval.c | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/Python/ceval.c b/Python/ceval.c
index 61928e39fe7..5a35524a247 100644
--- a/Python/ceval.c
+++ b/Python/ceval.c
@@ -3090,7 +3090,10 @@ fast_block_end:
                    Python main loop. */
                 PyErr_NormalizeException(
                     &exc, &val, &tb);
-                PyException_SetTraceback(val, tb);
+                if (tb != NULL)
+                    PyException_SetTraceback(val, tb);
+                else
+                    PyException_SetTraceback(val, Py_None);
                 Py_INCREF(exc);
                 tstate->exc_type = exc;
                 Py_INCREF(val);