expired session cookie leads to 500 error page when configuring a plan

system.error.request.information:

• Request URL: http://localhost:8085/bamboo/500.action
• Scheme: http
• Server: localhost
• Port: 8085
• URI: /bamboo/500.action
• Context Path: /bamboo
• Servlet Path: /500.action
• Path Info:
• Query String:

Stack Trace:

java.lang.NullPointerException
at com.atlassian.bamboo.security.acegi.acls.BambooAclUpdateHelper.createNewDefaultAcl(BambooAclUpdateHelper.java:329)
at com.atlassian.bamboo.session.BambooSession.getBuildCreationBean(BambooSession.java:55)