internal error in Node's debugger

[asyncanup]

anup@ubuntu:~$ cat test.js
var http = require('http');
var count = 0;

http.createServer(function (request, response) {
console.log("Writin' response");
count += 1;
response.writeHead(200, {'Content-Type': 'text/plain'});
response.end('Hello World\n');
}).listen(8124);

console.log('Server running at http://127.0.0.1:8124/');

anup@ubuntu:~$ node debug test.js
debug> run
debugger listening on port 5858
connecting...ok
breakpoint #1 in #.[anonymous](exports=#, require=function require%28path%29 {
return Module._load%28path, self%29;
}, module=#, __filename=/home/anup/test.js, __dirname=/home/anup), /home/anup/test.js:1
(function (exports, require, module, __filename, __dirname) { var http = require('http');
^
debug> continue
debug> Server running at http://127.0.0.1:8124/

A debugging session is active. Quit anyway? (y or n) n
debug> list
There was an internal error in Node's debugger. Please report this bug.
Cannot read property 'source' of undefined
TypeError: Cannot read property 'source' of undefined
at _debugger.js:819:22
at _debugger.js:381:13
at Client._onResponse (_debugger.js:205:5)
at Protocol.onResponse (native)
at Protocol.execute (_debugger.js:95:14)
at Client. (_debugger.js:133:14)
at Client.emit (events.js:42:17)
at Client._onReadable (net.js:613:31)
at IOWatcher.onReadable as callback
anup@ubuntu:~$

[sh1mmer]

Works correctly in 0.5.9-pre but not in 0.4.12.

[sh1mmer]

Won't fix for 0.4.12 but it's working in HEAD.