From 9d545e653d61b761cf459caaf5128d2ed40692c0 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Florian=20N=C3=BCcke?= <florian@nuecke.de>
Date: Mon, 3 Mar 2014 00:09:07 +0100
Subject: [PATCH] added side check to avoid potential crash in GUIs

---
 src/main/java/li/cil/oc/common/container/Robot.scala | 9 ++++++---
 1 file changed, 6 insertions(+), 3 deletions(-)

diff --git a/src/main/java/li/cil/oc/common/container/Robot.scala b/src/main/java/li/cil/oc/common/container/Robot.scala
index 8fbdd7f91..380cf771d 100644
--- a/src/main/java/li/cil/oc/common/container/Robot.scala
+++ b/src/main/java/li/cil/oc/common/container/Robot.scala
@@ -1,5 +1,6 @@
 package li.cil.oc.common.container
 
+import cpw.mods.fml.common.FMLCommonHandler
 import li.cil.oc.api
 import li.cil.oc.common.tileentity
 import li.cil.oc.server.{PacketSender => ServerPacketSender}
@@ -25,9 +26,11 @@ class Robot(playerInventory: InventoryPlayer, robot: tileentity.Robot) extends P
 
   override def detectAndSendChanges() {
     super.detectAndSendChanges()
-    if (math.abs(robot.globalBuffer - lastSentBuffer) > 1) {
-      lastSentBuffer = robot.globalBuffer
-      ServerPacketSender.sendPowerState(robot)
+    if (FMLCommonHandler.instance.getEffectiveSide.isServer) {
+      if (math.abs(robot.globalBuffer - lastSentBuffer) > 1) {
+        lastSentBuffer = robot.globalBuffer
+        ServerPacketSender.sendPowerState(robot)
+      }
     }
   }