Boost.Python invalid keyword argument crashing the interpreter - boost-python

Question

I'm trying to define a class with multiple constructors methods, some of which take keyword arguments. Everything works as expected/intended until the constructor is passed a bad parameter list, in which case the interpreter dies instead of throwing an exception. Here's a minimal example:
#include <boost/python.hpp>
#include <string>
class Crash {
public:
Crash(std::string) { }
Crash(int, int) { }
};
BOOST_PYTHON_MODULE(mymodule) {
using namespace boost::python;
class_<Crash>("Crash", init<std::string>())
.def(init<int, int>((arg("i") = 3)))
;
}
Output:
Python 2.7.3 (default, Apr 10 2012, 23:31:26) [MSC v.1500 32 bit (Intel)] on win 32
Type "help", "copyright", "credits" or "license" for more information.
>>> import mymodule as mm
>>> mm.Crash("asdf")
<mymodule.Crash object at 0x00D9FB70>
>>> mm.Crash(3)
<mymodule.Crash object at 0x00D9FE10>
>>> mm.Crash(4, i=5)
<mymodule.Crash object at 0x00D9FB70>
>>> mm.Crash(i=3) # kills the interpreter
Putting in an invalid keyword, e.g., Crash(blah=4), also kills the interpreter.
Is this a Boost.Python bug, or am I doing something wrong?
I'm using Boost 1.51 / Python 2.7.3 / MSVC 9.0.