diff -r 32ebd1846d07 Modules/_ctypes/_ctypes.c
--- a/Modules/_ctypes/_ctypes.c	Fri Jul 26 15:54:07 2013 +0200
+++ b/Modules/_ctypes/_ctypes.c	Fri Jul 26 22:57:38 2013 +0200
@@ -3453,7 +3453,7 @@ static PyObject *
         Py_INCREF(v);
         return v;
     }
-    if (kwds && (v = PyDict_GetItem(kwds, name))) {
+    if (kwds && name && (v = PyDict_GetItem(kwds, name))) {
         ++*pindex;
         Py_INCREF(v);
         return v;