Program: 46542
Project: 46542
Buggy source:
@Override public void onPlayerMove(final PlayerMoveEvent event){
  Location target=event.getTo();
  World world=target.getWorld();
  int i=0;
  protectedWorlds=props.temp.split("String_Node_Str");
  for (int x=protectedWorlds.length; x > 0; x--) {
    if (world.getName().equals(protectedWorlds[i])) {
      isPrt=1;
    }
    i++;
  }
  if (isPrt == 0) {
    permissionsPlugin=plugin.getServer().getPluginManager().getPlugin("String_Node_Str");
    final Block block=world.getBlockAt(new Location(world,target.getX(),target.getY() - 1,target.getZ()));
    final Block blockxs=world.getBlockAt(new Location(world,target.getX() - 0.4,target.getY(),target.getZ()));
    final Block blockxp=world.getBlockAt(new Location(world,target.getX() + 0.4,target.getY(),target.getZ()));
    final Block blockzs=world.getBlockAt(new Location(world,target.getX(),target.getY(),target.getZ() - 0.4));
    final Block blockzp=world.getBlockAt(new Location(world,target.getX(),target.getY(),target.getZ() + 0.4));
    dmgDealt=props.damageDealt * 2;
    dmgDelay=props.damageDelay * 20;
    air=new ItemStack(Material.AIR);
    int y=0;
    blockIDs=props.blockID.split("String_Node_Str");
    for (int x=blockIDs.length; x > 0; x--) {
      int ids=Integer.parseInt(blockIDs[y]);
      if (block.getTypeId() == ids || blockxs.getTypeId() == ids || blockxp.getTypeId() == ids || blockzs.getTypeId() == ids || blockzp.getTypeId() == ids) {
        isBlock=1;
      }
 else {
        isBlock=0;
      }
      y++;
    }
    if (isBlock == 1) {
      if (IsFirst == 0) {
        if (!event.getPlayer().getInventory().getBoots().equals(air) && props.bootMod.equals("String_Node_Str")) {
          dmgDealt=dmgDealt / 2;
        }
        if (permissionsPlugin != null) {
          if (!(plugin).permissionHandler.has(event.getPlayer(),"String_Node_Str")) {
            IsDmg=1;
            IsFirst=1;
            id=Bukkit.getServer().getScheduler().scheduleAsyncRepeatingTask(plugin,new Runnable(){
              public void run(){
                event.getPlayer().damage(dmgDealt);
              }
            }
,0L,dmgDelay);
          }
        }
 else {
          if (!event.getPlayer().isOp()) {
            IsDmg=1;
            IsFirst=1;
            id=Bukkit.getServer().getScheduler().scheduleAsyncRepeatingTask(plugin,new Runnable(){
              public void run(){
                event.getPlayer().damage(dmgDealt);
              }
            }
,0L,dmgDelay);
          }
        }
      }
    }
 else {
      if (IsDmg == 1) {
        Bukkit.getServer().getScheduler().cancelTask(id);
        Bukkit.getServer().getScheduler().cancelAllTasks();
        IsDmg=0;
        IsFirst=0;
      }
    }
  }
}

Fixed version (ground truth):
@Override public void onPlayerMove(final PlayerMoveEvent event){
  Location target=event.getTo();
  World world=target.getWorld();
  int i=0;
  protectedWorlds=props.temp.split("String_Node_Str");
  for (int x=protectedWorlds.length; x > 0; x--) {
    if (world.getName().equals(protectedWorlds[i])) {
      isPrt=1;
    }
    i++;
  }
  if (isPrt == 0) {
    permissionsPlugin=plugin.getServer().getPluginManager().getPlugin("String_Node_Str");
    final Block block=world.getBlockAt(new Location(world,target.getX(),target.getY() - 1,target.getZ()));
    final Block blockxs=world.getBlockAt(new Location(world,target.getX() - 0.4,target.getY(),target.getZ()));
    final Block blockxp=world.getBlockAt(new Location(world,target.getX() + 0.4,target.getY(),target.getZ()));
    final Block blockzs=world.getBlockAt(new Location(world,target.getX(),target.getY(),target.getZ() - 0.4));
    final Block blockzp=world.getBlockAt(new Location(world,target.getX(),target.getY(),target.getZ() + 0.4));
    dmgDealt=props.damageDealt * 2;
    dmgDelay=props.damageDelay * 20;
    air=new ItemStack(Material.AIR);
    int y=0;
    blockIDs=props.blockID.split("String_Node_Str");
    for (int x=blockIDs.length; x > 0; x--) {
      if (blockIDs[y].contains("String_Node_Str")) {
        wool=blockIDs[y].split("String_Node_Str");
        data=Integer.parseInt(wool[1]);
        ids=Integer.parseInt(wool[0]);
      }
 else {
        ids=Integer.parseInt(blockIDs[y]);
      }
      if (block.getTypeId() == ids || blockxs.getTypeId() == ids || blockxp.getTypeId() == ids || blockzs.getTypeId() == ids || blockzp.getTypeId() == ids) {
        if (ids == 6 || ids == 17 || ids == 35 || ids == 44) {
          if (block.getData() == data || blockxs.getData() == data || blockxp.getData() == data || blockzs.getData() == data || blockzp.getData() == data) {
            isBlock=1;
          }
        }
 else {
          isBlock=1;
        }
      }
 else {
        isBlock=0;
      }
      y++;
    }
    if (isBlock == 1) {
      if (IsFirst == 0) {
        if (!event.getPlayer().getInventory().getBoots().equals(air) && props.bootMod.equals("String_Node_Str")) {
          dmgDealt=dmgDealt / 2;
        }
        if (permissionsPlugin != null) {
          if (!(plugin).permissionHandler.has(event.getPlayer(),"String_Node_Str")) {
            IsDmg=1;
            IsFirst=1;
            id=Bukkit.getServer().getScheduler().scheduleAsyncRepeatingTask(plugin,new Runnable(){
              public void run(){
                event.getPlayer().damage(dmgDealt);
              }
            }
,0L,dmgDelay);
          }
        }
 else {
          if (!event.getPlayer().isOp()) {
            IsDmg=1;
            IsFirst=1;
            id=Bukkit.getServer().getScheduler().scheduleAsyncRepeatingTask(plugin,new Runnable(){
              public void run(){
                event.getPlayer().damage(dmgDealt);
              }
            }
,0L,dmgDelay);
          }
        }
      }
    }
 else {
      if (IsDmg == 1) {
        Bukkit.getServer().getScheduler().cancelTask(id);
        Bukkit.getServer().getScheduler().cancelAllTasks();
        IsDmg=0;
        IsFirst=0;
      }
    }
  }
}