diff -r d736c9490333 Python/ceval.c
--- a/Python/ceval.c	Sun Jun 19 11:22:47 2016 +0300
+++ b/Python/ceval.c	Sun Jun 19 14:50:28 2016 +0300
@@ -2815,7 +2815,7 @@ PyEval_EvalFrameEx(PyFrameObject *f, int
             Py_INCREF(func);
             from = POP();
             level = TOP();
-            if (PyLong_AsLong(level) != -1 || PyErr_Occurred())
+            if (level != Py_None)
                 args = PyTuple_Pack(5,
                             name,
                             f->f_globals,