diff --git a/lua/app/userdata/hero/hero_entity.lua b/lua/app/userdata/hero/hero_entity.lua
index d81628fc..1aec126d 100644
--- a/lua/app/userdata/hero/hero_entity.lua
+++ b/lua/app/userdata/hero/hero_entity.lua
@@ -129,6 +129,9 @@ function HeroEntity:setEquipAttrValue(name, value)
 end
 
 function HeroEntity:addEquipAttrValue(name, value)
+	if self.equipAttr[name] == nil then
+		self.equipAttr[name] = 0
+	end
 	self.equipAttr[name] = self.equipAttr[name] + value
 end