A test for issue #1848. Please try this with any mods you can @ 1.8.8, and see if you still get log spam of any kind (not just the

log message from the issue either).

src/main/java/net/minecraftforge/fml/common/network/FMLOutboundHandler.java

@@ -276,14 +276,12 @@ public class FMLOutboundHandler extends ChannelOutboundHandlerAdapter {
         if (dispatchers == null)
         {
             ctx.write(msg, promise);
-            promise.setSuccess();
             return;
         }
         for (NetworkDispatcher targetDispatcher : dispatchers)
         {
             targetDispatcher.sendProxy((FMLProxyPacket) msg);
         }
-        promise.setSuccess();
     }
 
 }