Program: 25883
Project: 25883
Buggy source:
@Override public int runBlockCheck(Player p,Block b,BlockFace bf,long ls,int aid){
  if (p == null || b == null || aid != 0) {
    return 0;
  }
  long diff=(System.currentTimeMillis() - this.getLastBreak(p.getName()));
  this.lastBreak.put(p.getName(),System.currentTimeMillis());
  if (Utils.instantBreak(b.getType()) || p.getGameMode() == GameMode.CREATIVE) {
    if (p.getGameMode() == GameMode.CREATIVE) {
      if (diff <= 200) {
        int id=this.vars.raiseViolationLevel(CheckType.SPEED_BREAK,p);
        ViolationTriggeredEvent vte=new ViolationTriggeredEvent(id,CheckType.SPEED_BREAK,p);
        Bukkit.getServer().getPluginManager().callEvent(vte);
        if (!vte.isCancelled()) {
          if (id != 0) {
            String message=Setting.speedbreakmes;
            message=message.replaceAll("String_Node_Str",ChatColor.YELLOW + "String_Node_Str" + p.getName()+ "String_Node_Str"+ ChatColor.GREEN);
            message=message.replaceAll("String_Node_Str",id + "String_Node_Str");
            Utils.messageAdmins(message);
          }
          return 1;
        }
      }
    }
  }
 else {
    if (!Utils.canSeeBlock(p,b)) {
      int id=this.vars.raiseViolationLevel(CheckType.VISIBLE,p);
      ViolationTriggeredEvent vte=new ViolationTriggeredEvent(id,CheckType.VISIBLE,p);
      Bukkit.getServer().getPluginManager().callEvent(vte);
      if (!vte.isCancelled()) {
        if (id != 0) {
          String message=Setting.blockvisiblebreak;
          message=message.replaceAll("String_Node_Str",ChatColor.YELLOW + "String_Node_Str" + p.getName()+ "String_Node_Str"+ ChatColor.GREEN);
          message=message.replaceAll("String_Node_Str",id + "String_Node_Str");
          Utils.messageAdmins(message);
        }
        return 4;
      }
    }
  }
  return 0;
}

Fixed version (ground truth):
@Override public int runBlockCheck(Player p,Block b,BlockFace bf,long ls,int aid){
  if (p == null || b == null || aid != 0) {
    return 0;
  }
  long diff=(System.currentTimeMillis() - this.getLastBreak(p.getName()));
  this.lastBreak.put(p.getName(),System.currentTimeMillis());
  if (Utils.instantBreak(b.getType()) || p.getGameMode() == GameMode.CREATIVE) {
    if (p.getGameMode() == GameMode.CREATIVE) {
      if (diff <= 200) {
        if (Setting.debug) {
          Bukkit.broadcastMessage("String_Node_Str" + diff);
        }
        int id=this.vars.raiseViolationLevel(CheckType.SPEED_BREAK,p);
        ViolationTriggeredEvent vte=new ViolationTriggeredEvent(id,CheckType.SPEED_BREAK,p);
        Bukkit.getServer().getPluginManager().callEvent(vte);
        if (!vte.isCancelled()) {
          if (id != 0) {
            String message=Setting.speedbreakmes;
            message=message.replaceAll("String_Node_Str",ChatColor.YELLOW + "String_Node_Str" + p.getName()+ "String_Node_Str"+ ChatColor.GREEN);
            message=message.replaceAll("String_Node_Str",id + "String_Node_Str");
            Utils.messageAdmins(message);
          }
          return 1;
        }
      }
    }
  }
 else {
    if (!Utils.canSeeBlock(p,b)) {
      int id=this.vars.raiseViolationLevel(CheckType.VISIBLE,p);
      ViolationTriggeredEvent vte=new ViolationTriggeredEvent(id,CheckType.VISIBLE,p);
      Bukkit.getServer().getPluginManager().callEvent(vte);
      if (!vte.isCancelled()) {
        if (id != 0) {
          String message=Setting.blockvisiblebreak;
          message=message.replaceAll("String_Node_Str",ChatColor.YELLOW + "String_Node_Str" + p.getName()+ "String_Node_Str"+ ChatColor.GREEN);
          message=message.replaceAll("String_Node_Str",id + "String_Node_Str");
          Utils.messageAdmins(message);
        }
        return 4;
      }
    }
  }
  return 0;
}