Crash when opening .NET files

[dradu]

IDA crashes when opening .NET files.
Repro: Open any .NET file in IDA and it will show a message box immediately:
"IDA has encountered a problem...A mini dump file was created".

Versions:
IDA version: 6.4.130111
Hexrays: 1.8.0.130110
HexRays Python: 0.9.0

When renaming the Python Hexrays plugin the issue is not present.