--- a/util/events.lua	Wed May 04 15:31:32 2016 +0200
+++ b/util/events.lua	Thu May 12 18:45:30 2016 +0100
@@ -131,7 +131,7 @@
 			end
 		end
 		if #w == 0 then
-			if event_name == nil then
+			if event_name == false then
 				global_wrappers = nil;
 			else
 				wrappers[event_name] = nil;