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.

1 files changed, 1 insertions, 1 deletions

diff --git a/Python/ceval.c b/Python/ceval.c
index c632488..8e396fd 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;