--- a/net/server_event.lua	Tue Apr 19 18:20:39 2016 +0200
+++ b/net/server_event.lua	Tue Apr 19 18:58:30 2016 +0200
@@ -545,7 +545,7 @@
 					elseif interface.startsslcallback then  -- start ssl connection if needed
 						debug "starting ssl handshake after writing"
 						interface.eventstarthandshake = addevent( base, nil, EV_TIMEOUT, interface.startsslcallback, 0 )
-					elseif interface.writebuffer ~= 0 then
+					elseif interface.writebufferlen ~= 0 then
 						-- data possibly written from ondrain
 						return EV_WRITE, cfg.WRITE_TIMEOUT
 					elseif interface.eventreadtimeout then