diff -r d75393f1eb8d src/org/python/core/PyXRange.java
--- a/src/org/python/core/PyXRange.java	Sat Jun 04 18:00:50 2011 -0700
+++ b/src/org/python/core/PyXRange.java	Thu Jun 09 02:51:15 2011 +0200
@@ -127,8 +127,7 @@
 
     @Override
     protected PyObject getslice(int start, int stop, int step) {
-        // not supported
-        return null;
+        throw Py.TypeError("xrange indices must be integers");
     }
 
     @Override