Index: ext/ed.cpp
--- ext/ed.cpp.orig
+++ ext/ed.cpp
@@ -1115,11 +1115,8 @@ void ConnectionDescriptor::_WriteOutboundData()
 	}
 	#endif
 
-	// We should never have gotten here if there were no data to write,
-	// so assert that as a sanity check.
-	// Don't bother to make sure nbytes is less than output_buffer because
-	// if it were we probably would have crashed already.
-	assert (nbytes > 0);
+	if (nbytes <= 0)
+		return;
 
 	assert (GetSocket() != INVALID_SOCKET);
 	#ifdef HAVE_WRITEV
@@ -1862,6 +1859,9 @@ void DatagramDescriptor::Write()
 		EpollEvent.events |= EPOLLOUT;
 	assert (MyEventMachine);
 	MyEventMachine->Modify (this);
+	#endif
+	#ifdef HAVE_KQUEUE
+	MyEventMachine->ArmKqueueWriter (this);
 	#endif
 	#ifdef HAVE_KQUEUE
 	bKqueueArmWrite = SelectForWrite();