Fix

src/main/java/refinedstorage/tile/TileBase.java

@@ -31,7 +31,7 @@ public abstract class TileBase extends TileEntity implements ITickable {
 
         if (!worldObj.isRemote) {
             if (this instanceof ISynchronizedContainer) {
-                for (EntityPlayer player : worldObj.getMinecraftServer().getPlayerList().getPlayerList()) {
+                for (EntityPlayer player : worldObj.playerEntities) {
                     if (((ISynchronizedContainer) this).getContainer() == player.openContainer.getClass()) {
                         RefinedStorage.NETWORK.sendTo(new MessageTileContainerUpdate(this), (EntityPlayerMP) player);
                     }