Ruby-odbc giving memory access error

I’m using ruby-odbc on a macbook pro, trying to connect to an Oracle
database (10g), using Actual Technologies ODBC driver, I was working
through bugs until I got to this:

$ irb

require ‘odbc’
=> true

conn = ODBC::connect(‘mySID’, ‘user’, ‘pass’)
=> #ODBC::Database:0x10bf800

stmt = conn.indexes(‘MY_TABLE’)
Invalid memory access of location 00000000 eip=0131509f
(irb):3: [BUG] Bus Error
ruby 1.8.6 (2007-03-13) [i686-darwin8.9.1]