diff --git a/rc.lua b/rc.lua
index d2cb20a..dec7b3a 100644
--- a/rc.lua
+++ b/rc.lua
@@ -1063,7 +1063,7 @@ client.connect_signal("manage", function (c)
         -- Prevent clients from being unreachable after screen count changes.
         awful.placement.no_offscreen(c)
     end
-    if string.find(c.instance, "QuakeConsole") then update_quake_console(c) end
+    if c.instance ~= nil and string.find(c.instance, "QuakeConsole") then update_quake_console(c) end
 end)
 
 -- Add a titlebar if titlebars_enabled is set to true in the rules.