Patch crashes on save with access violation

See: http://forums.bethsoft.com/topic/1615914-wrye-bash-thread-114/page-6#entry25325056

It is probably a memory issue or something else but still at least a nice error message...

Bugdump from post above:

Wrye Bash starting
Using Wrye Bash Version 307.201612302300 (Standalone)
OS info: Windows-7-6.1.7601-SP1
Python version: 2.7.12
wxPython version: 2.8.12.1 (msw-unicode)
input encoding: None; output encoding: None; locale: ('sv_SE', 'cp1252')
filesystem encoding: mbcs
Searching for game to manage:
bush.pyo   71 _supportedGames: Detected the following supported games via Windows Registry:
bush.pyo   73 _supportedGames:  oblivion: D:\Games\Bethesda Softworks\Oblivion
bush.pyo  131 _detectGames: Detecting games via the -o argument, bash.ini and relative path:
bush.pyo  137 _detectGames: Set game mode to oblivion found in parent directory of Mopy:  D:\Games\Bethesda Softworks\Oblivion
bush.pyo  172 setGame: No preferred game specified.
bush.pyo  152 __setGame:  Using oblivion game: D:\Games\Bethesda Softworks\Oblivion
testing UAC
mods_metadata.pyo  224 __init__: Using LOOT API version: 0.10.2
Traceback (most recent call last):
  File "bash\balt.pyo", line 417, in <lambda>
  File "bash\balt.pyo", line 1563, in _conversation_wrapper
  File "bash\basher\patcher_dialog.pyo", line 199, in PatchExecute
  File "bash\basher\patcher_dialog.pyo", line 299, in _save_cbash
  File "bash\cint.pyo", line 14269, in save
WindowsError: exception: access violation reading 0x0BFEB40F

Repro in the post above - initial instructions in http://forums.bethsoft.com/topic/1615914-wrye-bash-thread-114/page-6#entry25323182 but slimmed down in bugdump post

wrye-bash / CBash

Patch crashes on save with access violation #19