Program: 166140
Project: 166140
Buggy source:
private int dial(String player,Coordinate transmitter,int transDim,Coordinate coordinate,int dimension){
  World transWorld=RfToolsDimensionManager.getDimensionManager(worldObj).getWorldForDimension(transDim);
  if (transWorld == null) {
    return DialingDeviceTileEntity.DIAL_INVALID_SOURCE_MASK;
  }
  MatterTransmitterTileEntity transmitterTileEntity=(MatterTransmitterTileEntity)transWorld.getTileEntity(transmitter.getX(),transmitter.getY(),transmitter.getZ());
  if (!transmitterTileEntity.checkAccess(player)) {
    return DialingDeviceTileEntity.DIAL_TRANSMITTER_NOACCESS;
  }
  if (coordinate == null) {
    clearBeam(transmitter,transWorld);
    transmitterTileEntity.setTeleportDestination(null);
    return DialingDeviceTileEntity.DIAL_INTERRUPTED;
  }
  TeleportDestinations destinations=TeleportDestinations.getDestinations(worldObj);
  TeleportDestination teleportDestination=destinations.getDestination(coordinate,dimension);
  if (teleportDestination == null) {
    return DialingDeviceTileEntity.DIAL_INVALID_DESTINATION_MASK;
  }
  Coordinate c=teleportDestination.getCoordinate();
  World recWorld=RfToolsDimensionManager.getDimensionManager(worldObj).getWorldForDimension(teleportDestination.getDimension());
  if (recWorld == null) {
    return DialingDeviceTileEntity.DIAL_INVALID_DESTINATION_MASK;
  }
  TileEntity tileEntity=recWorld.getTileEntity(c.getX(),c.getY(),c.getZ());
  if (!(tileEntity instanceof MatterReceiverTileEntity)) {
    return DialingDeviceTileEntity.DIAL_INVALID_DESTINATION_MASK;
  }
  MatterReceiverTileEntity matterReceiverTileEntity=(MatterReceiverTileEntity)tileEntity;
  if (!matterReceiverTileEntity.checkAccess(player)) {
    return DialingDeviceTileEntity.DIAL_RECEIVER_NOACCESS;
  }
  int cost=TeleportConfiguration.rfPerDial;
  if (getEnergyStored(ForgeDirection.DOWN) < cost) {
    return DialingDeviceTileEntity.DIAL_DIALER_POWER_LOW_MASK;
  }
  if (!makeBeam(transmitter,transWorld,1,4,2)) {
    return DialingDeviceTileEntity.DIAL_TRANSMITTER_BLOCKED_MASK;
  }
  extractEnergy(ForgeDirection.DOWN,cost,false);
  transmitterTileEntity.setTeleportDestination(teleportDestination);
  return DialingDeviceTileEntity.DIAL_OK;
}

Fixed version (ground truth):
private int dial(String player,Coordinate transmitter,int transDim,Coordinate coordinate,int dimension){
  World transWorld=RfToolsDimensionManager.getDimensionManager(worldObj).getWorldForDimension(transDim);
  if (transWorld == null) {
    return DialingDeviceTileEntity.DIAL_INVALID_SOURCE_MASK;
  }
  MatterTransmitterTileEntity transmitterTileEntity=(MatterTransmitterTileEntity)transWorld.getTileEntity(transmitter.getX(),transmitter.getY(),transmitter.getZ());
  if (!transmitterTileEntity.checkAccess(player)) {
    return DialingDeviceTileEntity.DIAL_TRANSMITTER_NOACCESS;
  }
  if (coordinate == null) {
    clearBeam(transmitter,transWorld);
    transmitterTileEntity.setTeleportDestination(null);
    return DialingDeviceTileEntity.DIAL_INTERRUPTED;
  }
  boolean rftoolsDimension[]=new boolean[]{false};
  TeleportDestination teleportDestination=findDestination(coordinate,dimension,rftoolsDimension);
  if (teleportDestination == null) {
    return DialingDeviceTileEntity.DIAL_INVALID_DESTINATION_MASK;
  }
  Coordinate c=teleportDestination.getCoordinate();
  World recWorld=RfToolsDimensionManager.getDimensionManager(worldObj).getWorldForDimension(teleportDestination.getDimension());
  if (recWorld == null) {
    recWorld=MinecraftServer.getServer().worldServerForDimension(teleportDestination.getDimension());
    if (recWorld == null) {
      return DialingDeviceTileEntity.DIAL_INVALID_DESTINATION_MASK;
    }
  }
  TileEntity tileEntity=recWorld.getTileEntity(c.getX(),c.getY(),c.getZ());
  if (!rftoolsDimension[0]) {
    if (!(tileEntity instanceof MatterReceiverTileEntity)) {
      return DialingDeviceTileEntity.DIAL_INVALID_DESTINATION_MASK;
    }
    MatterReceiverTileEntity matterReceiverTileEntity=(MatterReceiverTileEntity)tileEntity;
    if (!matterReceiverTileEntity.checkAccess(player)) {
      return DialingDeviceTileEntity.DIAL_RECEIVER_NOACCESS;
    }
  }
  int cost=TeleportConfiguration.rfPerDial;
  if (getEnergyStored(ForgeDirection.DOWN) < cost) {
    return DialingDeviceTileEntity.DIAL_DIALER_POWER_LOW_MASK;
  }
  if (!makeBeam(transmitter,transWorld,1,4,2)) {
    return DialingDeviceTileEntity.DIAL_TRANSMITTER_BLOCKED_MASK;
  }
  extractEnergy(ForgeDirection.DOWN,cost,false);
  transmitterTileEntity.setTeleportDestination(teleportDestination);
  return DialingDeviceTileEntity.DIAL_OK;
}