Barbarian AC Bugged [NaN]

I'm putting together the character sheets for my players by click-dragging the classes from the compendium onto the character sheet and when I got to the barbarian the AC calculates with an NaN (Not a Number) result. I've tried manually resetting the calculation in the edit function and deleting and re-making the sheet manually from scratch. Using the custom AC setting always brings an NaN result no matter what stats I use. The 'Automatic' Ac tracking seems to work fine.

Have you manually entered the ability_mod stats, by any chance? Try changing the ability scores so the mod recalculates, and see what happens. What happens if you set it to 10 + NONE + NONE (and unequip any armor, including shields)?

No change. still comes back with NaN.

I am assuming that you are playing D&D5e. What character sheet are you using?  Rather than drag and dropping, have you tried running the charactermancer?  Check the Abilities and Attributes tab, make sure the "custom_ac_flag" is set to 1, see if custom_ac_part1 and custom_ac_part2 are set correctly.

D&D 5e, Standard default character sheet (OGL I believe), Charactermancer does the same thing upon completion, double checked the attributes tab everything reads correctly except for the "ac" result, custom ac flags and related attributes are all correct.