diff --git a/src/main/scala/li/cil/oc/common/EventHandler.scala b/src/main/scala/li/cil/oc/common/EventHandler.scala
index 083fee326..d236182c8 100644
--- a/src/main/scala/li/cil/oc/common/EventHandler.scala
+++ b/src/main/scala/li/cil/oc/common/EventHandler.scala
@@ -121,7 +121,7 @@ object EventHandler {
     val invalid = mutable.ArrayBuffer.empty[Robot]
     runningRobots.foreach(robot => {
       if (robot.isInvalid) invalid += robot
-      else robot.machine.update()
+      else if (robot.world != null) robot.machine.update()
     })
     runningRobots --= invalid
   }
diff --git a/src/main/scala/li/cil/oc/integration/fmp/CablePart.scala b/src/main/scala/li/cil/oc/integration/fmp/CablePart.scala
index fb44f01a1..ec08516ca 100644
--- a/src/main/scala/li/cil/oc/integration/fmp/CablePart.scala
+++ b/src/main/scala/li/cil/oc/integration/fmp/CablePart.scala
@@ -33,7 +33,7 @@ import scala.collection.convert.WrapAsScala._
 class CablePart(val original: Option[tileentity.Cable] = None) extends SimpleBlockPart with TCuboidPart with TNormalOcclusion with network.Environment {
   val node = api.Network.newNode(this, Visibility.None).create()
 
-  private var _color = 0
+  private var _color = Color.LightGray
 
   original.foreach(cable => _color = cable.color)