diff -r b53b029895df Python/ceval.c
--- a/Python/ceval.c	Mon Feb 11 00:28:02 2013 +0000
+++ b/Python/ceval.c	Mon Feb 11 15:44:33 2013 -0800
@@ -3252,8 +3252,14 @@
     }
     for (i = start; i < end; i++) {
         if (GETLOCAL(i) == NULL) {
-            PyObject *raw = PyTuple_GET_ITEM(co->co_varnames, i);
-            PyObject *name = PyObject_Repr(raw);
+            PyObject *raw;
+            PyObject *name;
+            if (PyTuple_GET_SIZE(co->co_varnames) <= i) {
+                Py_DECREF(missing_names);
+                return;
+            }
+            raw = PyTuple_GET_ITEM(co->co_varnames, i);
+            name = PyObject_Repr(raw);
             if (name == NULL) {
                 Py_DECREF(missing_names);
                 return;