Core with java 1.5

Hi all,
sometimes when trying to make a clone() of Response class (obtained with 
ResponseEvent.getResponse()), it produces a core. Sometimes it occurs when 
you clone an invite response, others when info response, ....
Java version is:

java version "1.5.0_01"
Java(TM) 2 Runtime Environment, Standard Edition (build 1.5.0_01-b08)
Java HotSpot(TM) Server VM (build 1.5.0_01-b08, mixed mode)

Any idea?

Thanks in advance,
Fran.

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