diff -r ba84d1e9a742 Python/bltinmodule.c
--- a/Python/bltinmodule.c	Mon May 26 00:40:09 2014 -0700
+++ b/Python/bltinmodule.c	Mon May 26 15:29:24 2014 -0400
@@ -738,6 +738,11 @@
     }
     else if (locals == Py_None)
         locals = globals;
+    if (!globals || !locals) {
+        PyErr_SetString(PyExc_SystemError, 
+               "globals and locals cannot be NULL");
+        return NULL;
+    }
     if (PyDict_GetItemString(globals, "__builtins__") == NULL) {
         if (PyDict_SetItemString(globals, "__builtins__",
                                  PyEval_GetBuiltins()) != 0)