I upgraded my kamailio server from version 4.0.1 to 4.1.1, then i noticed that all my "AVP's variavels" that are initialized on initial "INVITE", are all set as null when call goes to failure route, so kamailio is not keeping the variavel values for same call(dialog)

When it happens i see the following warning "WARNING: tm [t_lookup.c:1536]: t_unref(): WARNING: script writer didn't release transaction"
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Regards