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F.CHI2DOF fails on LHCb::Particle* (from C. Hasse)

F.CHI2DOF fails on LHCb::Particle* (from C. Hasse)

running the following code:

# mass constrained
DTF_MC = DTFAlg(Input=data_filtered, MassConstraints=["D-"])
DTFRelations_MC = DTF_MC.OutputRelations

B_variables = FunctorCollection({

   "DTF_MC_MASS": F.MAP_INPUT(Functor=F.MASS, Relations=DTFRelations_MC),
   "DTF_MC_CHI2DOF": F.MAP_INPUT(Functor=F.CHI2DOF, Relations=DTFRelations_MC), # F.CHI2DOF fails on LHCb::Particle*
   "DTF_MC_P": F.MAP_INPUT(Functor=F.P, Relations=DTFRelations_MC),

)}

a crash due to the functor F.CHI2DOF is observed

C. Hasse told me it's because F.CHI2DOF fails on LHCb::Particle*

the .log file is attachedproblem.log