Program: 172832
Project: 172832
Buggy source:
@Override public CommandResult execute(CommandSource source,CommandContext context) throws CommandException {
  String factionName=context.<String>getOne("String_Node_Str").get();
  if (FactionLogic.getFactionsNames().contains(factionName)) {
    Faction faction=FactionLogic.getFaction(factionName);
    List<Text> factionInfo=new ArrayList<>();
    String leaderName="String_Node_Str";
    if (faction.Leader != null && !faction.Leader.equals("String_Node_Str"))     leaderName=PlayerService.getPlayerName(UUID.fromString(leaderName)).get();
    String membersList="String_Node_Str";
    if (!faction.Members.isEmpty() && faction.Members != null) {
      for (      String member : faction.Members) {
        membersList+=PlayerService.getPlayerName(UUID.fromString(member)).get() + "String_Node_Str";
      }
      membersList=membersList.substring(0,membersList.length() - 2);
    }
    String officersList="String_Node_Str";
    if (!faction.Officers.isEmpty() && faction.Officers != null) {
      for (      String officer : faction.Officers) {
        officersList+=PlayerService.getPlayerName(UUID.fromString(officer)).get() + "String_Node_Str";
      }
      officersList=officersList.substring(0,officersList.length() - 2);
    }
    String alliancesList="String_Node_Str";
    if (!faction.Alliances.isEmpty() && faction.Alliances != null) {
      for (      String alliance : faction.Alliances) {
        alliancesList+=alliance + "String_Node_Str";
      }
      alliancesList=alliancesList.substring(0,alliancesList.length() - 2);
    }
    String enemiesList="String_Node_Str";
    if (!faction.Enemies.isEmpty() && faction.Enemies != null) {
      for (      String enemy : faction.Enemies) {
        enemiesList+=enemy + "String_Node_Str";
      }
      enemiesList=enemiesList.substring(0,enemiesList.length() - 2);
    }
    Text info=Text.builder().append(Text.of(TextColors.AQUA,"String_Node_Str",TextColors.GOLD,faction.Name + "String_Node_Str")).append(Text.of(TextColors.AQUA,"String_Node_Str",TextColors.GOLD,faction.Tag + "String_Node_Str")).append(Text.of(TextColors.AQUA,"String_Node_Str",TextColors.GOLD,leaderName + "String_Node_Str")).append(Text.of(TextColors.AQUA,"String_Node_Str",TextColors.GOLD,officersList + "String_Node_Str")).append(Text.of(TextColors.AQUA,"String_Node_Str",TextColors.BLUE,alliancesList + "String_Node_Str")).append(Text.of(TextColors.AQUA,"String_Node_Str",TextColors.RED,enemiesList + "String_Node_Str")).append(Text.of(TextColors.AQUA,"String_Node_Str",TextColors.GREEN,membersList + "String_Node_Str")).append(Text.of(TextColors.AQUA,"String_Node_Str",TextColors.GOLD,faction.Power + "String_Node_Str" + PowerService.getFactionMaxPower(faction)+ "String_Node_Str")).append(Text.of(TextColors.AQUA,"String_Node_Str",TextColors.GOLD,String.valueOf(FactionLogic.getClaims(factionName).size()) + "String_Node_Str" + String.valueOf(faction.Power.intValue()))).build();
    factionInfo.add(info);
    PaginationService paginationService=Sponge.getServiceManager().provide(PaginationService.class).get();
    PaginationList.Builder paginationBuilder=paginationService.builder().title(Text.of(TextColors.GREEN,"String_Node_Str")).contents(factionInfo);
    paginationBuilder.sendTo(source);
    CommandResult.success();
  }
 else {
    source.sendMessage(Text.of(PluginInfo.ErrorPrefix,TextColors.RED,"String_Node_Str",TextColors.GOLD,factionName));
  }
  return CommandResult.success();
}

Fixed version (ground truth):
@Override public CommandResult execute(CommandSource source,CommandContext context) throws CommandException {
  String factionName=context.<String>getOne("String_Node_Str").get();
  if (FactionLogic.getFactionsNames().contains(factionName)) {
    Faction faction=FactionLogic.getFaction(factionName);
    List<Text> factionInfo=new ArrayList<>();
    String leaderName="String_Node_Str";
    if (faction.Leader != null && !faction.Leader.equals("String_Node_Str"))     leaderName=PlayerService.getPlayerName(UUID.fromString(faction.Leader)).get();
    String membersList="String_Node_Str";
    if (!faction.Members.isEmpty() && faction.Members != null) {
      for (      String member : faction.Members) {
        membersList+=PlayerService.getPlayerName(UUID.fromString(member)).get() + "String_Node_Str";
      }
      membersList=membersList.substring(0,membersList.length() - 2);
    }
    String officersList="String_Node_Str";
    if (!faction.Officers.isEmpty() && faction.Officers != null) {
      for (      String officer : faction.Officers) {
        officersList+=PlayerService.getPlayerName(UUID.fromString(officer)).get() + "String_Node_Str";
      }
      officersList=officersList.substring(0,officersList.length() - 2);
    }
    String alliancesList="String_Node_Str";
    if (!faction.Alliances.isEmpty() && faction.Alliances != null) {
      for (      String alliance : faction.Alliances) {
        alliancesList+=alliance + "String_Node_Str";
      }
      alliancesList=alliancesList.substring(0,alliancesList.length() - 2);
    }
    String enemiesList="String_Node_Str";
    if (!faction.Enemies.isEmpty() && faction.Enemies != null) {
      for (      String enemy : faction.Enemies) {
        enemiesList+=enemy + "String_Node_Str";
      }
      enemiesList=enemiesList.substring(0,enemiesList.length() - 2);
    }
    Text info=Text.builder().append(Text.of(TextColors.AQUA,"String_Node_Str",TextColors.GOLD,faction.Name + "String_Node_Str")).append(Text.of(TextColors.AQUA,"String_Node_Str",TextColors.GOLD,faction.Tag + "String_Node_Str")).append(Text.of(TextColors.AQUA,"String_Node_Str",TextColors.GOLD,leaderName + "String_Node_Str")).append(Text.of(TextColors.AQUA,"String_Node_Str",TextColors.GOLD,officersList + "String_Node_Str")).append(Text.of(TextColors.AQUA,"String_Node_Str",TextColors.BLUE,alliancesList + "String_Node_Str")).append(Text.of(TextColors.AQUA,"String_Node_Str",TextColors.RED,enemiesList + "String_Node_Str")).append(Text.of(TextColors.AQUA,"String_Node_Str",TextColors.GREEN,membersList + "String_Node_Str")).append(Text.of(TextColors.AQUA,"String_Node_Str",TextColors.GOLD,faction.Power + "String_Node_Str" + PowerService.getFactionMaxPower(faction)+ "String_Node_Str")).append(Text.of(TextColors.AQUA,"String_Node_Str",TextColors.GOLD,String.valueOf(FactionLogic.getClaims(factionName).size()) + "String_Node_Str" + String.valueOf(faction.Power.intValue()))).build();
    factionInfo.add(info);
    PaginationService paginationService=Sponge.getServiceManager().provide(PaginationService.class).get();
    PaginationList.Builder paginationBuilder=paginationService.builder().title(Text.of(TextColors.GREEN,"String_Node_Str")).contents(factionInfo);
    paginationBuilder.sendTo(source);
    CommandResult.success();
  }
 else {
    source.sendMessage(Text.of(PluginInfo.ErrorPrefix,TextColors.RED,"String_Node_Str",TextColors.GOLD,factionName));
  }
  return CommandResult.success();
}