diff -r 5296d60364ad Objects/unicodeobject.c
--- a/Objects/unicodeobject.c	Mon Oct 10 23:21:10 2016 -0700
+++ b/Objects/unicodeobject.c	Wed Oct 12 00:15:32 2016 +0800
@@ -2891,7 +2891,6 @@
             do
             {
                 if ((unsigned char)*p > 127) {
-                    va_end(vargs2);
                     PyErr_Format(PyExc_ValueError,
                         "PyUnicode_FromFormatV() expects an ASCII-encoded format "
                         "string, got a non-ASCII byte: 0x%02x",