[otrs] Postmaster error

Hi all, I don't know what could have been happened but I'm experiencing a Quantifier follows nothing in regex; marked by <-- HERE in m/* <-- HERE Delivery Status Notification*/ at /home/otrs//Kernel/System/PostMaster/Filter/Match.pm wherever Postmaster runs (manually or scheduled) and then it leave a dirty record in process_id (it seems) does anyone had a similar problem ? what could I check ? (I've checked all the postmasterfilter but I can find any strange thing on them: is there a way to know what is eventually the troubling filter if this is the problem ? ) Thank you in advance. MV