Index: slaughter.lua
===================================================================
--- slaughter.lua	(revision 4904)
+++ slaughter.lua	(working copy)
@@ -106,7 +106,7 @@
 		local attackChange = t.getAttackChange(self, t)
 
 		local effStalker = self:hasEffect(self.EFF_STALKER)
-		if core.fov.distance(self.x, self.y, effStalker.target.x, effStalker.target.y) > 1 then effStalker = nil end
+		if effStalker and core.fov.distance(self.x, self.y, effStalker.target.x, effStalker.target.y) > 1 then effStalker = nil end
 		for i = 1, 4 do
 			local target
 			if effStalker and not effStalker.target.dead then