diff --git a/src/actions/HeroAction.lua b/src/actions/HeroAction.lua
index ec9c723..7fe4bf8 100644
--- a/src/actions/HeroAction.lua
+++ b/src/actions/HeroAction.lua
@@ -1468,7 +1468,7 @@ function _M.trainStartRpc(agent, data)
 
 	-- 大于等于7的时候需要装备火花才能升
 	if curLevel >= 7 then
-		if #sparkInfo == 0 then
+		if next(sparkInfo) == 0 then
 			return 6
 		end
 		local ok = false
--
libgit2 0.21.2