From 90bbcf19038b0f951883303db9f7a4ce474e40bd Mon Sep 17 00:00:00 2001
From: Daniel Hahler <github@thequod.de>
Date: Mon, 23 Jan 2017 22:53:01 +0100
Subject: [PATCH] awful.tag: handle invalid client in delayed_call (#1372)

A short-lived client (e.g. `urxvt -e false`) might be invalid already
when the delayed callback is called.
---
 lib/awful/tag.lua | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/lib/awful/tag.lua b/lib/awful/tag.lua
index a71fa058..66bd0c10 100644
--- a/lib/awful/tag.lua
+++ b/lib/awful/tag.lua
@@ -1387,6 +1387,9 @@ capi.client.connect_signal("property::screen", function(c)
     -- awful.rules. It is also messing up the tags before the user have a chance
     -- to set them manually.
     timer.delayed_call(function()
+        if not c.valid then
+            return
+        end
         local tags, new_tags = c:tags(), {}
 
         for _, t in ipairs(tags) do