ToME: the Tales of Maj'Eyal

The solid shot tinker throws this error if it doesn't kill the target:

in orc.teaac\data\talents\other.lua

newTalent{
name = "Solid Shell", short_name = "TINKER_SOLID_SHELL",
type = {"steamtech/other",1},
points = 5,
cooldown = 10,
steam = 5,
radius = 0,
range = steamgun_range,
requires_target = true,
tactical = { ATTACK = { PHYSICAL = 2 }, ESCAPE = { knockback = 2 }},
target = function(self, t) return {type="ball", range=nil, radius=self:getTalentRadius(t), selffire=false} end,
on_pre_use = function(self, t, silent) if not self:hasArcheryWeapon("steamgun") then if not silent then game.logPlayer(self, "You require a steamgun for this talent.") end return false end return true end,
getMultiple = function(self, t) return self:combatTalentWeaponDamage(t, 0.5, 3) end,
knockback = function(self, t) return math.floor(self:combatTalentScale(t, 2, 6)) end,
archery_onhit = function(self, t, target, x, y)
if target:canBe("knockback") and not target.dead then
---------------------change here!!-------------------------
target:knockback(self.x, self.y, t.knockback(self, t), false)
----------------------------------------------------
target:crossTierEffect(target.EFF_OFFBALANCE, self:combatSteampower())
game.logSeen(target, "%s is knocked back!", target.name:capitalize())
else
game.logSeen(target, "%s resists the knockback!", target.name:capitalize())
end
end,

I think it haven't been fixed in 2018.