Program: 10476
Project: 10476
Buggy source:
@EventHandler public void offlinePlayerTags(ReplaceableTagEvent event){
  if (!event.matches("String_Node_Str") || !event.hasOfflinePlayer())   return;
  OfflinePlayer p=event.getOfflinePlayer();
  String type=event.getType() != null ? event.getType().toUpperCase() : "String_Node_Str";
  String subType=event.getSubType() != null ? event.getSubType().toUpperCase() : "String_Node_Str";
  if (type.equals("String_Node_Str"))   event.setReplaced(String.valueOf(p.hasPlayedBefore()));
 else   if (type.equals("String_Node_Str"))   event.setReplaced(String.valueOf(p.isOp()));
 else   if (type.equals("String_Node_Str"))   event.setReplaced(String.valueOf(p.isBanned()));
 else   if (type.equals("String_Node_Str"))   event.setReplaced(String.valueOf(p.isOnline()));
 else   if (type.equals("String_Node_Str")) {
    if (event.hasTypeContext()) {
      if (aH.matchesInteger(event.getTypeContext())) {
        if (PlayerTags.playerChatHistory.containsKey(p.getName())) {
          List<String> history=PlayerTags.playerChatHistory.get(p.getName());
          if (history.size() < aH.getIntegerFrom(event.getTypeContext()))           event.setReplaced(history.get(history.size() - 1));
 else           event.setReplaced(history.get(aH.getIntegerFrom(event.getTypeContext()) - 1));
        }
      }
    }
 else {
      if (PlayerTags.playerChatHistory.containsKey(p.getName())) {
        event.setReplaced(PlayerTags.playerChatHistory.get(p.getName()).get(0));
      }
    }
  }
 else   if (type.equals("String_Node_Str")) {
    event.setReplaced(p.getName());
  }
 else   if (type.equals("String_Node_Str")) {
    if (subType.equals("String_Node_Str"))     if (p.getBedSpawnLocation() != null) {
      event.setReplaced(p.getBedSpawnLocation().getBlockX() + "String_Node_Str" + p.getBedSpawnLocation().getBlockY()+ "String_Node_Str"+ p.getBedSpawnLocation().getBlockZ()+ "String_Node_Str"+ p.getBedSpawnLocation().getWorld());
    }
  }
 else   if (type.equals("String_Node_Str")) {
    if (Depends.economy != null) {
      event.setReplaced(String.valueOf(Depends.economy.getBalance(p.getName())));
      if (subType.equals("String_Node_Str"))       event.setReplaced(String.valueOf((int)Depends.economy.getBalance(p.getName())));
 else       if (subType.equals("String_Node_Str"))       event.setReplaced(Depends.economy.currencyNameSingular());
 else       if (subType.equals("String_Node_Str"))       event.setReplaced(Depends.economy.currencyNamePlural());
    }
 else {
      dB.echoError("String_Node_Str");
    }
  }
 else   if (event.getType().startsWith("String_Node_Str")) {
    event.setReplaced(String.valueOf(event.getPlayer().getExp() * 100));
  }
}

Fixed version (ground truth):
@EventHandler public void offlinePlayerTags(ReplaceableTagEvent event){
  if (!event.matches("String_Node_Str") || !event.hasOfflinePlayer())   return;
  OfflinePlayer p=event.getOfflinePlayer();
  String type=event.getType() != null ? event.getType().toUpperCase() : "String_Node_Str";
  String subType=event.getSubType() != null ? event.getSubType().toUpperCase() : "String_Node_Str";
  if (type.equals("String_Node_Str"))   event.setReplaced(String.valueOf(p.hasPlayedBefore()));
 else   if (type.equals("String_Node_Str"))   event.setReplaced(String.valueOf(p.isOp()));
 else   if (type.equals("String_Node_Str"))   event.setReplaced(String.valueOf(p.isBanned()));
 else   if (type.equals("String_Node_Str"))   event.setReplaced(String.valueOf(p.isOnline()));
 else   if (type.equals("String_Node_Str")) {
    if (event.hasTypeContext()) {
      if (aH.matchesInteger(event.getTypeContext())) {
        if (PlayerTags.playerChatHistory.containsKey(p.getName())) {
          List<String> history=PlayerTags.playerChatHistory.get(p.getName());
          if (history.size() < aH.getIntegerFrom(event.getTypeContext()))           event.setReplaced(history.get(history.size() - 1));
 else           event.setReplaced(history.get(aH.getIntegerFrom(event.getTypeContext()) - 1));
        }
      }
    }
 else {
      if (PlayerTags.playerChatHistory.containsKey(p.getName())) {
        event.setReplaced(PlayerTags.playerChatHistory.get(p.getName()).get(0));
      }
    }
  }
 else   if (type.equals("String_Node_Str")) {
    event.setReplaced(p.getName());
  }
 else   if (type.equals("String_Node_Str")) {
    if (subType.equals("String_Node_Str"))     if (p.getBedSpawnLocation() != null) {
      event.setReplaced(p.getBedSpawnLocation().getBlockX() + "String_Node_Str" + p.getBedSpawnLocation().getBlockY()+ "String_Node_Str"+ p.getBedSpawnLocation().getBlockZ()+ "String_Node_Str"+ p.getBedSpawnLocation().getWorld().getName());
    }
  }
 else   if (type.equals("String_Node_Str")) {
    if (Depends.economy != null) {
      event.setReplaced(String.valueOf(Depends.economy.getBalance(p.getName())));
      if (subType.equals("String_Node_Str"))       event.setReplaced(String.valueOf((int)Depends.economy.getBalance(p.getName())));
 else       if (subType.equals("String_Node_Str"))       event.setReplaced(Depends.economy.currencyNameSingular());
 else       if (subType.equals("String_Node_Str"))       event.setReplaced(Depends.economy.currencyNamePlural());
    }
 else {
      dB.echoError("String_Node_Str");
    }
  }
 else   if (event.getType().startsWith("String_Node_Str")) {
    event.setReplaced(String.valueOf(event.getPlayer().getExp() * 100));
  }
}