NullPointerException when selecting Modify tab

if you create a document with an attachment, go to summary, click "Edit online", and then try to go on "Modify" tab, you get an exception:

java.lang.NullPointerException
at org.nuxeo.ecm.ui.web.listener.ejb.DocumentActionsBean.getChangeableDocumentType(DocumentActionsBean.java:130)
at sun.reflect.GeneratedMethodAccessor627.invoke(Unknown Source)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
at java.lang.reflect.Method.invoke(Method.java:585)
at org.jboss.aop.joinpoint.MethodInvocation.invokeNext(MethodInvocation.java:112)
at org.jboss.ejb3.interceptor.InvocationContextImpl.proceed(InvocationContextImpl.java:166)
at org.nuxeo.ecm.ui.web.intercept.ErrorHandlingInterceptor.invokeAndWrapExceptions(ErrorHandlingInterceptor.java:49)