diff --git a/src/main/scala/li/cil/oc/common/tileentity/traits/OpenSides.scala b/src/main/scala/li/cil/oc/common/tileentity/traits/OpenSides.scala
index 73438e3b1..cc8f3bb63 100644
--- a/src/main/scala/li/cil/oc/common/tileentity/traits/OpenSides.scala
+++ b/src/main/scala/li/cil/oc/common/tileentity/traits/OpenSides.scala
@@ -28,7 +28,8 @@ trait OpenSides extends TileEntity {
 
   override def readFromNBTForServer(nbt: NBTTagCompound) {
     super.readFromNBTForServer(nbt)
-    openSides = uncompressSides(nbt.getByte(Settings.namespace + "openSides"))
+    if (nbt.hasKey(Settings.namespace + "openSides"))
+      openSides = uncompressSides(nbt.getByte(Settings.namespace + "openSides"))
   }
 
   override def writeToNBTForServer(nbt: NBTTagCompound) {