Stop mystcraft worlds appearing in Dynmap

[Schpoon]

Hi guys,

I have been trying the solutions from
http://forum.feed-the-beast.com/threads/keeping-dynmap-from-rendering-mystcraft-worlds.7030/
http://forum.feed-the-beast.com/threads/warning-about-dynmap.2428/

But when the client starts it just closes when loading Dynmap.

I have changed the deftemplatesuffix: bogus
and my worlds.txt consists of the following

worlds:
- name: world
title: "Overworld"
template: normal
- name: world_nether
title: "Nether"
template: nether
- name: world_the_end
title: "The End"
template: normal
- name: world_7
title: "Twilight"
template: normal


Can anyone see what is wrong?