Regression: Wicket error when document is deleted

Steps to reproduce
1) Open Gogreen Enterprise
2) Go to Documents and copy /documents/hippogogreen/events/2013/03/workshop-urban-green-space-design to 'my document'
3) Delete the document with Document/Delete...
4) Type in 'California' in the search box and press enter
Expected: Documents with California found
Actual No feedback. In the log:

[INFO] [talledLocalContainer] 29.10.2013 13:04:03 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:buttons:0:button' on page 'class org.hippoecm.frontend.PluginPage
[INFO] [talledLocalContainer] at org.apache.wicket.core.request.handler.PageAndComponentProvider.getComponent(PageAndComponentProvider.java:182)
[