Exception creating new event Could not find component 'dialog:content:form:name'

Steps to reproduce:
1) login Go Green Enterprise
2) Go to Documents/2014/11
3) Add new Event, fill in name
Result:
Document is created but exception in console:
[INFO] [talledLocalContainer] 16.12.2013 18:05:23 ERROR [org.apache.wicket.DefaultExceptionMapper.internalMap():123] Unexpected error occurred
[INFO] [talledLocalContainer] org.apache.wicket.core.request.handler.ComponentNotFoundException: Could not find component 'dialog:content:form:name' on page 'class org.hippoecm.frontend.PluginPage
[INFO] [talledLocalContainer] at org.apache.wicket.core.request.handler.PageAndComponentProvider.getComponent(PageAndComponentProvider.java:182)
[INFO] [talledLocalContainer] at org.apache.wicket.core.request.handler.ListenerInterfaceRequestHandler.getComponent(ListenerInterfaceRequestHandler.java:90)
[INFO] [talledLocalContainer] at org.apache.wicket.core.request.handler.ListenerInterfaceRequestHandler.respond(ListenerInterfaceRequestHandler.java:231)