If you take a ASF and switch it from standard to ferro-aluminium armor, MML will give you an extra item to allocate called "Ferro-Aluminium", tonnage will be equal to the armor tonnage, but it will be listed as having 0 crits. This shouldn't be happening as FA armor for ASFs is already correctly applied by reducing the number of weapons that can be mounted on the wings.
Still valid but the error listed in the log does not show up in 0.1.59 so it must be from something else.