diff --git a/src/adv/AdvBattle.lua b/src/adv/AdvBattle.lua
index 5eaed83..166906d 100644
--- a/src/adv/AdvBattle.lua
+++ b/src/adv/AdvBattle.lua
@@ -107,6 +107,7 @@ end
 
 function Battle:initMapEnemys(mapIdx)
 	self.enemys[mapIdx] = {}
+	self.builds[mapIdx] = {}
 	local map = self.adv.maps[mapIdx]
 	if map then
 		for _, room in pairs(map.rooms) do
--
libgit2 0.21.2