diff --git a/src/adv/Adv.lua b/src/adv/Adv.lua
index 4f14254..963fe45 100644
--- a/src/adv/Adv.lua
+++ b/src/adv/Adv.lua
@@ -799,7 +799,7 @@ local function clickTrader(self, room, block, params)
 	if (block.event.status or ""):getv(buyId, 0) == 1 then return false, 3 end -- 买过了
 
 	local buyCount = #((block.event.status or ""):toArray())
-	if traderData.purchasetime <= buyCount then return false, 4 end
+	if traderData.purchasetime ~= 0 and traderData.purchasetime <= buyCount then return false, 4 end
 
 	local goodsData = csvdb["event_trader_goodsCsv"][block.event.shop[buyId][1]]
 	if not goodsData then return false, 5 end
@@ -821,7 +821,7 @@ local function clickTrader(self, room, block, params)
 	self:checkAchievement(Adv.AchievType.Shop, 1, block.event.id)
 	self:backReward(reward)
 
-	if traderData.purchasetime <= buyCount or #block.event.shop <= buyCount then
+	if (traderData.purchasetime ~= 0 and traderData.purchasetime <= buyCount) or #block.event.shop <= buyCount then
 		block:clear()
 	end
 	return true
--
libgit2 0.21.2