DWH Exception in Daily log

Hi,
I noticed to day, that I get (once in a few days) the following exception:

Exception in thread “Timer-1” INFO 15-10 00:59:17,276 - Write to log - before calc -
------------> Linenr 331------------------------------
aggr_name = entry
date_id = 20141029
aggr_hour = 22

====================
java.util.ConcurrentModificationException
at java.util.LinkedList$ListItr.checkForComodification(LinkedList.java:778)
at java.util.LinkedList$ListItr.next(LinkedList.java:713)
at org.pentaho.di.core.logging.CentralLogStore$1.run(CentralLogStore.java:60)
at java.util.TimerThread.mainLoop(Timer.java:534)
at java.util.TimerThread.run(Timer.java:484)

Any idea?