ubiquity crashed with TypeError in partman_column_name(): argument of type 'NoneType' is not iterable

Was about to install ubuntu 12.01 LTS alpha 2 and then this appeared

ProblemType: Crash
DistroRelease: Ubuntu 12.04
Package: ubiquity 2.9.15
ProcVersionSignature: Ubuntu 3.2.0-12.21-generic 3.2.2
Uname: Linux 3.2.0-12-generic x86_64
ApportVersion: 1.91-0ubuntu1
Architecture: amd64
CasperVersion: 1.303
Date: Fri Feb 3 09:44:17 2012
ExecutablePath: /usr/lib/ubiquity/bin/ubiquity
InterpreterPath: /usr/bin/python2.7
LiveMediaBuild: Ubuntu 12.04 LTS "Precise Pangolin" - Alpha amd64 (20120201.1)
ProcCmdline: /usr/bin/python /usr/lib/ubiquity/bin/ubiquity --greeter --only
ProcEnviron: Error: [Errno 13] Permission denied: '/proc/4300/environ'
PythonArgs: ['/usr/lib/ubiquity/bin/ubiquity', '--greeter', '--only']
SourcePackage: ubiquity
Title: ubiquity crashed with TypeError in partman_column_name(): argument of type 'NoneType' is not iterable
Traceback:
 Traceback (most recent call last):
   File "/usr/lib/ubiquity/plugins/ubi-partman.py", line 593, in partman_column_name
     if 'id' not in partition:
 TypeError: argument of type 'NoneType' is not iterable
UpgradeStatus: No upgrade log present (probably fresh install)
UserGroups: