diff -r ee9921b29fd8 Python/ceval.c
--- a/Python/ceval.c	Mon Apr 18 21:21:10 2016 +0300
+++ b/Python/ceval.c	Mon Apr 18 20:18:18 2016 -0400
@@ -4890,6 +4890,14 @@
 {
     PyObject *callargs, *w;
 
+    if (!nstack) {
+        if (!stararg) {
+            return PyTuple_New(0);
+        }
+        Py_INCREF(stararg);
+        return stararg;
+    }
+
     callargs = PyTuple_New(nstack + nstar);
     if (callargs == NULL) {
         return NULL;