Program: 174057
Project: 174057
Buggy source:
@Override protected void executeCommand(CommandEvent event){
  Channel channel=ArgsUtils.findChannel(event,event.getArgs());
  Guild guild=event.getGuild();
  if (channel == null)   return;
  EmbedBuilder eb=new EmbedBuilder();
  MessageBuilder mb=new MessageBuilder();
  StringBuilder sb=new StringBuilder();
  int position;
  if (channel instanceof TextChannel)   position=guild.getTextChannels().indexOf(channel);
 else   if (channel instanceof VoiceChannel)   position=guild.getVoiceChannels().indexOf(channel);
 else   position=guild.getCategories().indexOf(channel);
  sb.append(Const.LINE_START).append("String_Node_Str").append(channel.getId()).append("String_Node_Str");
  sb.append(Const.LINE_START).append("String_Node_Str").append(position).append("String_Node_Str");
  sb.append(Const.LINE_START).append("String_Node_Str").append(channel.getCreationTime().format(DateTimeFormatter.RFC_1123_DATE_TIME)).append("String_Node_Str");
  sb.append(Const.LINE_START).append("String_Node_Str").append(channel.getMembers().size());
  if (channel instanceof VoiceChannel) {
    sb.append("String_Node_Str").append(((VoiceChannel)channel).getUserLimit() == 0 ? "String_Node_Str" : ((VoiceChannel)channel).getUserLimit()).append("String_Node_Str");
    sb.append(Const.LINE_START).append("String_Node_Str").append(((VoiceChannel)channel).getBitrate()).append("String_Node_Str");
  }
 else   sb.append("String_Node_Str");
  if (channel instanceof TextChannel && (!(((TextChannel)channel).getTopic() == null) || !(((TextChannel)channel).getTopic().isEmpty())))   eb.addField("String_Node_Str",((TextChannel)channel).getTopic(),false);
  if (channel instanceof net.dv8tion.jda.core.entities.Category) {
    net.dv8tion.jda.core.entities.Category category=(net.dv8tion.jda.core.entities.Category)channel;
    if (!(category.getTextChannels().isEmpty()))     eb.addField("String_Node_Str",category.getTextChannels().stream().map(IMentionable::getAsMention).collect(Collectors.joining("String_Node_Str")),false);
    if (!(category.getTextChannels().isEmpty()))     eb.addField("String_Node_Str",category.getVoiceChannels().stream().map(Channel::getName).collect(Collectors.joining("String_Node_Str")),false);
  }
  String name=channel instanceof TextChannel ? ((TextChannel)channel).getAsMention() : channel.getName();
  String title="String_Node_Str" + name + "String_Node_Str";
  eb.setColor(event.getSelfMember().getColor()).setDescription(sb.toString());
  event.reply(mb.setContent(title).setEmbed(eb.build()).build());
}

Fixed version (ground truth):
@Override protected void executeCommand(CommandEvent event){
  Channel channel;
  if (event.getArgs().isEmpty())   channel=event.getTextChannel();
 else   channel=ArgsUtils.findChannel(event,event.getArgs());
  Guild guild=event.getGuild();
  if (channel == null)   return;
  EmbedBuilder eb=new EmbedBuilder();
  MessageBuilder mb=new MessageBuilder();
  StringBuilder sb=new StringBuilder();
  int position;
  if (channel instanceof TextChannel)   position=guild.getTextChannels().indexOf(channel);
 else   if (channel instanceof VoiceChannel)   position=guild.getVoiceChannels().indexOf(channel);
 else   position=guild.getCategories().indexOf(channel);
  sb.append(Const.LINE_START).append("String_Node_Str").append(channel.getId()).append("String_Node_Str");
  sb.append(Const.LINE_START).append("String_Node_Str").append(position).append("String_Node_Str");
  sb.append(Const.LINE_START).append("String_Node_Str").append(channel.getCreationTime().format(DateTimeFormatter.RFC_1123_DATE_TIME)).append("String_Node_Str");
  sb.append(Const.LINE_START).append("String_Node_Str").append(channel.getMembers().size());
  if (channel instanceof VoiceChannel) {
    VoiceChannel vc=(VoiceChannel)channel;
    sb.append("String_Node_Str").append(vc.getUserLimit() == 0 ? "String_Node_Str" : vc.getUserLimit()).append("String_Node_Str");
    sb.append(Const.LINE_START).append("String_Node_Str").append(vc.getBitrate()).append("String_Node_Str");
  }
 else   sb.append("String_Node_Str");
  if (channel instanceof TextChannel) {
    TextChannel tc=(TextChannel)channel;
    if (!(tc.getTopic() == null || tc.getTopic().isEmpty()))     eb.addField("String_Node_Str",tc.getTopic(),false);
  }
 else   if (channel instanceof net.dv8tion.jda.core.entities.Category) {
    net.dv8tion.jda.core.entities.Category category=(net.dv8tion.jda.core.entities.Category)channel;
    if (!(category.getTextChannels().isEmpty()))     eb.addField("String_Node_Str",category.getTextChannels().stream().map(IMentionable::getAsMention).collect(Collectors.joining("String_Node_Str")),false);
    if (!(category.getVoiceChannels().isEmpty()))     eb.addField("String_Node_Str",category.getVoiceChannels().stream().map(Channel::getName).collect(Collectors.joining("String_Node_Str")),false);
  }
  String name=channel instanceof TextChannel ? ((TextChannel)channel).getAsMention() : channel.getName();
  String title="String_Node_Str" + name + "String_Node_Str";
  eb.setColor(event.getSelfMember().getColor()).setDescription(sb.toString());
  event.reply(mb.setContent(title).setEmbed(eb.build()).build());
}