diff --git a/lualib/skynet.lua b/lualib/skynet.lua
index ad2ba3c9..db79e8aa 100644
--- a/lualib/skynet.lua
+++ b/lualib/skynet.lua
@@ -531,7 +531,7 @@ function skynet.exit()
 		end
 	end
 	for session, co in pairs(session_id_coroutine) do
-		if type(co) == "thread" then
+		if type(co) == "thread" and co ~= running_thread then
 			coroutine.close(co)
 		end
 	end