KeyError: 1331918712

[grizzler0031]

Opening the demo.kdb database works fine, but when I try to open one of my own databases, I get this:
Traceback (most recent call last):
File "/usr/local/bin/kp", line 7, in
sys.exit(main())
File "/usr/local/lib/python2.7/dist-packages/keepassx/main.py", line 187, in main
args.run(args)
File "/usr/local/lib/python2.7/dist-packages/keepassx/main.py", line 64, in do_list
db = create_db(args)
File "/usr/local/lib/python2.7/dist-packages/keepassx/main.py", line 59, in create_db
key_file_contents=key_file_contents)
File "/usr/local/lib/python2.7/dist-packages/keepassx/db.py", line 159, in init
self.groups, self.entries = self._parse_payload(payload)
File "/usr/local/lib/python2.7/dist-packages/keepassx/db.py", line 213, in _parse_payload
entry.group = groups_by_groupid[entry.groupid]
KeyError: 1331918712

I have created a small test database (kpxtest.kdb, password: test123) to demonstrate this. I planned to attach it, but this bloody form won't accept it. So I put it here: http://duinsoft.nl/temp/kpxtest.zip

Any idea?

Regards,
Frank
Using Debian Testing Xfce 4.12