NPE thrown when trying to change project key

Steps to reproduce

1. Edit a review
2. Change the project to a non-existing project
3. Click done (there is no changes and error)
4. Edit the review again
5. Change the project to a non-existing project
6. Add a reviewer to the review
7. Click done and the following error happen:

   2013-05-03 16:08:44,739 ERROR [btpool0-12 ] fisheye TotalityFilter-logExceptionDetails - Exception "java.lang.NullPointerException" (javax.servlet.ServletException) while processing "/cru/postDetails.do" (Referer:"http://localhost:8060/cru/CR-1")
   javax.servlet.ServletException: java.lang.NullPointerException
   	at com.opensymphony.webwork.dispatcher.DispatcherUtils.serviceAction(DispatcherUtils.java:284)
   	at com.opensymphony.webwork.dispatcher.ServletDispatcher.service(ServletDispatcher.java:111)
   	at javax.servlet.http.HttpServlet.service(HttpServlet.java:820)
   	at org.mortbay.jetty.servlet.ServletHolder.handle(ServletHolder.java:511)
   	at org.mortbay.jetty.servlet.ServletHandler$Chain.doFilter(ServletHandler.java:1272)
   	at com.atlassian.plugin.servlet.filter.IteratingFilterChain.doFilter(IteratingFilterChain.java:46)
   	at com.atlassian.plugin.servlet.filter.DelegatingPluginFilter$1.doFilter(DelegatingPluginFilter.java:66)
   	at com.atlassian.applinks.core.rest.context.ContextFilter.doFilter(ContextFilter.java:25)
   	at com.atlassian.plugin.servlet.filter.DelegatingPluginFilter.doFilter(DelegatingPluginFilter.java:74)
   ...
   Caused by: java.lang.NullPointerException
   	at com.atlassian.crucible.actions.create.EditReviewDetailsAction.execute(EditReviewDetailsAction.java:338)
   	at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
   	at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
   	at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
   	at java.lang.reflect.Method.invoke(Method.java:597)
   	at com.opensymphony.xwork.DefaultActionInvocation.invokeAction(DefaultActionInvocation.java:358)
   	at com.opensymphony.xwork.DefaultActionInvocation.invokeActionOnly(DefaultActionInvocation.java:218)
   	at com.opensymphony.xwork.DefaultActionInvocation.invoke(DefaultActionInvocation.java:192)
   	at com.cenqua.crucible.interceptors.ReviewInterceptor.intercept(ReviewInterceptor.java:51)