Problem with error handling

I'm getting a "SystemError: null argument to internal routine" problem
that is gobbling up the actual error.  I turned on debugging and see
that the problem is that my connection is closed (and I have to connect
a second time to get it to work).  However, the SystemError hid this
until I turned on debugging.

In trying to find why the SystemError is happening, I found that at the
point pq_raise is called, no exception has been set.  The conn and pgres
objects are fine and the cursor is NULL.  The following call is NULL:

    code = PQresultErrorField(pgres, PG_DIAG_SQLSTATE);

This results in "exc" staying null.  Thus, when psyco_set_error is
called, only msg and pgerror are not NULL.  Since the cursor is NULL,
the connection object is not pulled, and the following line is valid:

    pymsg = conn_text_from_chars(conn, msg)

Subsequently, the following is called with "exc" set to NULL:

    err = PyObject_CallFunctionObjArgs(exc, pymsg, NULL);

Thus err is NULL and the if statement is not called.  Because it is not
called, PyErr_SetObject is never called.  All of this started with a
call to cursor.execute in Python.  That dropped down into the C module's
psyco_curs_execute.  That returns NULL without the PyErr object set,
which results in the SystemError.

I am guessing that the solution is one of the following:

*  PQresultErrorField  should not have returned NULL
* "exc" should have been calculated another way (like an else after the
"if (code != NULL)")

Regardless of the solution, thanks for your time.

-eric


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