diff -r d86eabe2c457 Python/ceval.c
--- a/Python/ceval.c	Mon Aug 08 03:11:06 2016 +0300
+++ b/Python/ceval.c	Mon Aug 08 12:46:18 2016 +0800
@@ -4164,6 +4164,9 @@
         goto raise_error;
     }
 
+    assert(type != NULL);
+    assert(value != NULL);
+
     if (cause) {
         PyObject *fixed_cause;
         if (PyExceptionClass_Check(cause)) {
@@ -4190,8 +4193,8 @@
 
     PyErr_SetObject(type, value);
     /* PyErr_SetObject incref's its arguments */
-    Py_XDECREF(value);
-    Py_XDECREF(type);
+    Py_DECREF(value);
+    Py_DECREF(type);
     return 0;
 
 raise_error: