diff --git a/src/adv/Adv.lua b/src/adv/Adv.lua
index dc747f1..c62be32 100644
--- a/src/adv/Adv.lua
+++ b/src/adv/Adv.lua
@@ -162,6 +162,7 @@ local function randomAdvMap(role, chapterId, level, notNotify)
 		local function randomCommon()
 			if not eventLib[etype] or not next(eventLib[etype]) or not eventLib[etype][especial] or not next(eventLib[etype][especial]) then return false end
 			event.id = math.randWeight(eventLib[etype][especial], "showup")
+			if not event.id then return false end
 			if eventLib[etype][especial][event.id].limit > 1 then
 				eventLib[etype][especial][event.id].limit = eventLib[etype][especial][event.id].limit - 1
 			elseif eventLib[etype][especial][event.id].limit == 1 then
--
libgit2 0.21.2