From f4d8f8c51f884eb179ee35a5ff8463d45d374c47 Mon Sep 17 00:00:00 2001
From: Johannes Lohrer <johanneslohrer@msn.com>
Date: Mon, 6 Jan 2014 01:00:52 +0100
Subject: [PATCH] cable only checks neighbor blocks if y >= 0 , Fixes #63

---
 li/cil/oc/common/block/Cable.scala | 21 +++++++++++----------
 1 file changed, 11 insertions(+), 10 deletions(-)

diff --git a/li/cil/oc/common/block/Cable.scala b/li/cil/oc/common/block/Cable.scala
index 774dcc772..7370ce896 100644
--- a/li/cil/oc/common/block/Cable.scala
+++ b/li/cil/oc/common/block/Cable.scala
@@ -91,16 +91,17 @@ object Cable {
   def neighbors(world: IBlockAccess, x: Int, y: Int, z: Int) = {
     var result = 0
     for (side <- ForgeDirection.VALID_DIRECTIONS) {
-      world.getBlockTileEntity(x + side.offsetX, y + side.offsetY, z + side.offsetZ) match {
-        case robot: tileentity.RobotProxy =>
-        case host: SidedEnvironment =>
-          val connects = if (host.getWorldObj.isRemote) host.canConnect(side.getOpposite) else host.sidedNode(side.getOpposite) != null
-          if (connects) {
-            result |= side.flag
-          }
-        case host: Environment => result |= side.flag
-        case _ =>
-      }
+      if (y + side.offsetY >= 0)
+        world.getBlockTileEntity(x + side.offsetX, y + side.offsetY, z + side.offsetZ) match {
+          case robot: tileentity.RobotProxy =>
+          case host: SidedEnvironment =>
+            val connects = if (host.getWorldObj.isRemote) host.canConnect(side.getOpposite) else host.sidedNode(side.getOpposite) != null
+            if (connects) {
+              result |= side.flag
+            }
+          case host: Environment => result |= side.flag
+          case _ =>
+        }
     }
     result
   }