Hi, I have an object "m_RegisterEvents" which holds a reference to a Python function. This Python function is a callback given by a Python script. To call this function, I simply do: void subsystem_script::register_events() { m_RegisterEvents(); } And it works. However, if a Python exception is thrown (and converted to the C++ exception boost::python::error_already_set), I get a segfault in the following function (m_ptr is null, hence the segfault): inline api::object_base::~object_base() { Py_DECREF(m_ptr); } This destructor is directly called at the end of the subsystem_script::register_events() function, leading me to believe that it is a temporary object being destructed. The funny thing is that if I do the following, then it works again. void subsystem_script::register_events() { try { m_RegisterEvents(); } catch (const error_already_set &) { } } However, doing a "throw;" in the catch to re-throw the exception does the same segfault. Converting the exception by throwing another object (e.g. std::runtime_error()) works. I must admit that I'm totally puzzled. Using Boost 1.33.1 with Visual C++ 2005. Tanguy