dak Debian package import error message: missing "source_suites"

dak_import

dak@server:/srv/dak/queue/unchecked$ dak import foobar main cassandra_1.2.8_all.deb 
Traceback (most recent call last):
  File "/usr/local/bin/dak", line 239, in <module>
    main()
  File "/usr/local/bin/dak", line 219, in main
    module.main()
  File "/tmp/dak/dak/import.py", line 235, in main
    add_overrides=add_overrides)
  File "/tmp/dak/dak/import.py", line 112, in import_file
    fingerprint=fingerprint, add_overrides=add_overrides)
  File "/tmp/dak/dak/import.py", line 92, in import_binary
    transaction.install_binary(directory, binary, suite, component, fingerprint=fingerprint)
  File "/tmp/dak/dak/daklib/archive.py", line 160, in install_binary
    .filter(Suite.suite_id == source_suites.c.id)
AttributeError: 'NoneType' object has no attribute 'c'