Problem with UT decoding in new MC samples

When testing the new MC samples using the files in the TestFileDB added in lhcb-datapkg/PRConfig!164 (merged), I came across a segmentation fault that seems related to the UT decoding, see the stack trace in the attachment stacktrack_newMC.txt

To produce the segmentation fault, I attach the options I used DC_newMC_Bd2Dstmumu.py and ran

Moore/run gaudirun.py DBASE/PRConfig/options/Moore/DataChallenges/DC_newMC_Bd2Dstmumu.py DBASE/PRConfig/options/Moore/DataChallenges/DC_default_conds.py Moore/Hlt/Moore/tests/options/DC_histo_file.py Moore/Hlt/RecoConf/options/hlt2_reco_baseline_with_mcchecking.py