Describe the bug
Showing a NaN value for concentration when in simulation mode

To Reproduce
Please see the values given in the simulation mode box in the screenshot
Recipe Difficulty: 460 (455+5)
Resourcefulness: 656
Skill: 472 (290+182)
Reagent Quality Bonus: 182

Expected behavior
Should just display 0 for concentration cost

Screenshots

Addon Version:
19.7.3

Additional context
Also shows "-0" concentration with other combinations of additional reagents (eg- Algari Missive)