Fix out-of-range indexes

technic/machines/register/cables.lua

@@ -103,8 +103,9 @@ function technic.register_cable_plate(nodename, data)
 				if (crtl.aux1 or crtl.sneak) and not (crtl.aux1 and crtl.sneak) and index ~= 0 then
 					local fine_pointed = minetest.pointed_thing_to_face_pos(placer, pointed_thing)
 					fine_pointed = vector.subtract(fine_pointed, pointed_thing.above)
+					index = index < 0 and -index or index
 					index = (index-1)%3+1
-					fine_pointed[xyz[index < 0 and -index or index]] = nil
+					fine_pointed[xyz[index]] = nil
 					local key_a, a = next(fine_pointed)
 					local key_b, b = next(fine_pointed, key_a)
 					local far_key = math.abs(a) > math.abs(b) and key_a or key_b