diff --git a/src/models/RolePlugin.lua b/src/models/RolePlugin.lua
index 44b8089..7683a35 100644
--- a/src/models/RolePlugin.lua
+++ b/src/models/RolePlugin.lua
@@ -740,6 +740,7 @@ function RolePlugin.bind(Role)
 	end
 
 	function Role:advChapterIsOpen(chapterId, layer)
+		layer = layer or 1
 		local exlayer = math.floor((layer - 1)  / 10) * 10 + 1
 
 		if exlayer == 1 then --第一层判断前置
--
libgit2 0.21.2