Assertion on xwiki execution.

Hi all I just installed the latest release of xwiki on my box, and found next assertion in the log file. 15:24:24,718 ERROR http-8080-Processor24 http://localhost:8080/xwiki/bin/view/Main/WebHome AssertionFailure:<init>:22 - an assertion failure occured (this may indicate a bug in Hibernate, but is more likely due to unsafe use of the session) org.hibernate.AssertionFailure: possible nonthreadsafe access to session at org.hibernate.action.EntityDeleteAction.execute(EntityDeleteAction.java:83) Configuration: Windows XP Pro SP2, jdk 1.5, Tomcat 5.5, PostgreSQL 8.0 Any body know how to fix it? -- With b/r, Viacheslav N Tararin