Haven't managed to track this down properly but gives an assertion error from ROOT when the likelihood is constructed in Utils::fitToMin() but only when a combiner is built of a single pdf.
This is somehow related to a product pdf having only one element. Not sure if it's a ROOT issue or a GC issue. For now there is a hack which is to add a second dummy pdf with no sensitivity to the parameters of interest.
Haven't managed to track this down properly but gives an assertion error from ROOT when the likelihood is constructed in Utils::fitToMin() but only when a combiner is built of a single pdf.
This is somehow related to a product pdf having only one element. Not sure if it's a ROOT issue or a GC issue. For now there is a hack which is to add a second dummy pdf with no sensitivity to the parameters of interest.
No time to track this down properly right now.