--- a/net/server_epoll.lua	Thu Oct 03 16:38:46 2019 +0100
+++ b/net/server_epoll.lua	Sat Oct 05 15:22:59 2019 +0200
@@ -668,6 +668,9 @@
 end
 
 function interface:pause_writes()
+	if self._write_lock then
+		return
+	end
 	self:debug("Pause writes");
 	self._write_lock = true;
 	self:setwritetimeout(false);
@@ -675,6 +678,9 @@
 end
 
 function interface:resume_writes()
+	if not self._write_lock then
+		return
+	end
 	self:debug("Resume writes");
 	self._write_lock = nil;
 	if self.writebuffer[1] then