From eec9331b207cf7def6f04156d00a8479d1630dd3 Mon Sep 17 00:00:00 2001
From: Victor Stinner <victor.stinner@gmail.com>
Date: Thu, 18 Aug 2016 18:13:10 +0200
Subject: Fix SystemError in "raise" statement

Issue #27558: Fix a SystemError in the implementation of "raise" statement.
In a brand new thread, raise a RuntimeError since there is no active
exception to reraise.

Patch written by Xiang Zhang.
---
 Python/ceval.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

(limited to 'Python')

diff --git a/Python/ceval.c b/Python/ceval.c
index c632488ec2..8e396fd2bc 100644
--- a/Python/ceval.c
+++ b/Python/ceval.c
@@ -4123,7 +4123,7 @@ do_raise(PyObject *exc, PyObject *cause)
         type = tstate->exc_type;
         value = tstate->exc_value;
         tb = tstate->exc_traceback;
-        if (type == Py_None) {
+        if (type == Py_None || type == NULL) {
             PyErr_SetString(PyExc_RuntimeError,
                             "No active exception to reraise");
             return 0;
-- 
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