From fd953a52f060d403c64ac0dcbef59d15dcbca2a5 Mon Sep 17 00:00:00 2001
From: Raoul Van den Berge <raoulvdberge@gmail.com>
Date: Sat, 5 Nov 2016 17:43:55 +0100
Subject: [PATCH] Don't construct crafting monitor elements if noone is
 watching

---
 .../refinedstorage/tile/TileController.java          | 12 ++++++++----
 1 file changed, 8 insertions(+), 4 deletions(-)

diff --git a/src/main/java/com/raoulvdberge/refinedstorage/tile/TileController.java b/src/main/java/com/raoulvdberge/refinedstorage/tile/TileController.java
index 0a77b79e4..f3fb729ca 100755
--- a/src/main/java/com/raoulvdberge/refinedstorage/tile/TileController.java
+++ b/src/main/java/com/raoulvdberge/refinedstorage/tile/TileController.java
@@ -538,11 +538,15 @@ public class TileController extends TileBase implements INetworkMaster, IEnergyR
 
     @Override
     public void sendCraftingMonitorUpdate() {
-        List<ICraftingMonitorElement> elements = getElements();
-
-        worldObj.getMinecraftServer().getPlayerList().getPlayerList().stream()
+        List<EntityPlayerMP> watchers = worldObj.getMinecraftServer().getPlayerList().getPlayerList().stream()
             .filter(player -> player.openContainer instanceof ContainerCraftingMonitor && pos.equals(((ContainerCraftingMonitor) player.openContainer).getCraftingMonitor().getNetworkPosition()))
-            .forEach(player -> RS.INSTANCE.network.sendTo(new MessageCraftingMonitorElements(elements), player));
+            .collect(Collectors.toList());
+
+        if (!watchers.isEmpty()) {
+            List<ICraftingMonitorElement> elements = getElements();
+
+            watchers.forEach(player -> RS.INSTANCE.network.sendTo(new MessageCraftingMonitorElements(elements), player));
+        }
     }
 
     @Override