NullpointerException while editing builder capability

We don't validate user input, in the label field for a new builder in the viewBuilders!default.action - so a user is able to specify special characters for builder label. For e.g @$%~maven

This persists fine - but when user goes to edit the builder the following exception is thrown -
{code]
java.lang.NullPointerException
at com.atlassian.bamboo.configuration.plugins.ConfigureBuilder.doEdit(ConfigureBuilder.java:88)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
.................................

Also, the user is unable to delete the builder from Bamboo - the only way to delete the builder, is to hack the adminstration.xml file.