diff --git a/src/actions/CarAction.lua b/src/actions/CarAction.lua
index dd4daf8..215e354 100644
--- a/src/actions/CarAction.lua
+++ b/src/actions/CarAction.lua
@@ -114,8 +114,8 @@ function _M.runeUpRpc( agent, data )
 	local runeData = runeSet[id]
 	if not runeData then return 5 end
 
-	local maxLv = table.nums(csvdb["rune_buildCsv"])-1
-	if level > maxLv then return 6 end
+	local maxLv = #csvdb["rune_buildCsv"]
+	if level >= maxLv then return 6 end
 	local lvData = csvdb["rune_buildCsv"][level]
 	local cost = lvData.cost:toNumMap()
 	if not role:checkItemEnough(cost) then
--
libgit2 0.21.2