Program: 38077
Project: 38077
Buggy source:
@Override public boolean onCommand(CommandPerformEvent event){
  if (event.getArgs().length == 1) {
    CommandModule module=event.getManager().getModuleFor(event.getArgs()[0]);
    if (module == null) {
      ArrayList<CommandModule> groupMatch=event.getManager().matchGroup(event.getArgs()[0]);
      if (groupMatch != null && !groupMatch.isEmpty()) {
        if (!event.isInPrivateMessage()) {
          event.respondWithPing("String_Node_Str");
        }
        event.respond("String_Node_Str" + StringUtil.combineSplit(0,groupMatch.toArray(new String[0]),"String_Node_Str"),event.getArgs()[0].toUpperCase());
        event.respond("String_Node_Str",event.getCommandPrefix() + "String_Node_Str");
        return true;
      }
      module=event.getManager().matchModule(event.getArgs()[0]);
      if (module == null) {
        event.errorWithPing("String_Node_Str",event.getArgs()[0]);
        return true;
      }
    }
    if (!event.isInPrivateMessage()) {
      event.respondWithPing("String_Node_Str");
    }
    event.respond("String_Node_Str",true,event.getCommandPrefix(),module.info().command(),module.info().help());
    event.respond("String_Node_Str",true,module.info().command(),StringUtil.combineSplit(0,module.info().aliases(),"String_Node_Str"));
    for (    String part : module.info().extendedHelp()) {
      event.respond(event.getManager().format(module,part),true);
    }
    return true;
  }
  if (!event.isInPrivateMessage()) {
    event.respondWithPing("String_Node_Str");
  }
  List<String> commands=new ArrayList<>();
  for (  CommandModule module : event.getManager().getRegisteredCommands()) {
    List<CommandGroup> groups=Arrays.asList(module.info().groups());
    if (!groups.contains(CommandGroup.ALL)) {
      continue;
    }
    commands.add(module.info().command());
  }
  event.respond("String_Node_Str" + StringUtil.combineSplit(0,commands.toArray(new String[0]),"String_Node_Str"));
  event.respond("String_Node_Str",event.getCommandPrefix() + "String_Node_Str");
  for (  Map.Entry<CommandGroup,ArrayList<CommandModule>> entry : event.getManager().getGroupsMap().entrySet()) {
    if (entry.getKey().exclude()) {
      continue;
    }
    ArrayList<CommandModule> modules=entry.getValue();
    if (!modules.isEmpty()) {
      event.respond(event.getManager().format(null,"String_Node_Str" + entry.getKey() + "String_Node_Str"+ (modules.size() > 1 ? "String_Node_Str" : "String_Node_Str")),true,modules.size() + "String_Node_Str");
    }
  }
  return true;
}

Fixed version (ground truth):
@Override public boolean onCommand(CommandPerformEvent event){
  if (event.getArgs().length == 1) {
    CommandModule module=event.getManager().getModuleFor(event.getArgs()[0]);
    if (module == null) {
      ArrayList<CommandModule> groupMatch=event.getManager().matchGroup(event.getArgs()[0]);
      if (groupMatch != null && !groupMatch.isEmpty()) {
        if (!event.isInPrivateMessage()) {
          event.respondWithPing("String_Node_Str");
        }
        ArrayList<String> groupCommands=new ArrayList<>();
        for (        CommandModule groupModule : groupMatch) {
          groupCommands.add(groupModule.info().command());
        }
        event.respond("String_Node_Str" + StringUtil.combineSplit(0,groupCommands.toArray(new String[0]),"String_Node_Str"),true,event.getArgs()[0].toUpperCase());
        event.respond("String_Node_Str",true,event.getCommandPrefix() + "String_Node_Str");
        return true;
      }
      module=event.getManager().matchModule(event.getArgs()[0]);
      if (module == null) {
        event.errorWithPing("String_Node_Str",event.getArgs()[0]);
        return true;
      }
    }
    if (!event.isInPrivateMessage()) {
      event.respondWithPing("String_Node_Str");
    }
    event.respond("String_Node_Str",true,event.getCommandPrefix(),module.info().command(),module.info().help());
    event.respond("String_Node_Str",true,module.info().command(),StringUtil.combineSplit(0,module.info().aliases(),"String_Node_Str"));
    for (    String part : module.info().extendedHelp()) {
      event.respond(event.getManager().format(module,part),true);
    }
    return true;
  }
  if (!event.isInPrivateMessage()) {
    event.respondWithPing("String_Node_Str");
  }
  List<String> commands=new ArrayList<>();
  for (  CommandModule module : event.getManager().getRegisteredCommands()) {
    List<CommandGroup> groups=Arrays.asList(module.info().groups());
    if (!groups.contains(CommandGroup.ALL)) {
      continue;
    }
    commands.add(module.info().command());
  }
  event.respond("String_Node_Str" + StringUtil.combineSplit(0,commands.toArray(new String[0]),"String_Node_Str"),true);
  event.respond("String_Node_Str",true,event.getCommandPrefix() + "String_Node_Str");
  for (  Map.Entry<CommandGroup,ArrayList<CommandModule>> entry : event.getManager().getGroupsMap().entrySet()) {
    if (entry.getKey().exclude()) {
      continue;
    }
    ArrayList<CommandModule> modules=entry.getValue();
    if (!modules.isEmpty()) {
      event.respond(event.getManager().format(null,"String_Node_Str" + entry.getKey() + "String_Node_Str"+ (modules.size() > 1 ? "String_Node_Str" : "String_Node_Str")),true,modules.size() + "String_Node_Str");
    }
  }
  return true;
}