Program: 27784
Project: 27784
Buggy source:
@Override public Optional<CommandResult> process(CommandSource source,String commandLine){
  final String[] argSplit=commandLine.split("String_Node_Str",2);
  final CommandEvent event=SpongeEventFactory.createCommand(this.game,argSplit.length > 1 ? argSplit[1] : "String_Node_Str",source,argSplit[0],null);
  this.game.getEventManager().post(event);
  if (event.isCancelled()) {
    return event.getResult();
  }
  try {
    try {
      return this.dispatcher.process(source,commandLine);
    }
 catch (    InvocationCommandException ex) {
      if (ex.getCause() != null) {
        throw ex.getCause();
      }
    }
catch (    CommandPermissionException ex) {
      Text text=ex.getText();
      if (text != null) {
        source.sendMessage(error(text));
      }
    }
catch (    CommandException ex) {
      Text text=ex.getText();
      if (text != null) {
        source.sendMessage(error(text));
      }
      final Optional<CommandMapping> mapping=this.dispatcher.get(argSplit[0],source);
      if (mapping.isPresent()) {
        source.sendMessage(error(t("String_Node_Str",argSplit[0],mapping.get().getCallable().getUsage(source))));
      }
    }
  }
 catch (  Throwable thr) {
    TextBuilder excBuilder=Texts.builder(thr.getMessage());
    if (source.hasPermission("String_Node_Str")) {
      final StringWriter writer=new StringWriter();
      thr.printStackTrace(new PrintWriter(writer));
      excBuilder.onHover(TextActions.showText(Texts.of(writer.toString().replaceAll("String_Node_Str","String_Node_Str"))));
    }
    source.sendMessage(error(t("String_Node_Str",excBuilder.build())));
    this.log.error(Texts.toPlain(t("String_Node_Str",commandLine,source.toString(),thr.getMessage())),thr);
  }
  return Optional.of(CommandResult.empty());
}

Fixed version (ground truth):
@Override public Optional<CommandResult> process(CommandSource source,String commandLine){
  final String[] argSplit=commandLine.split("String_Node_Str",2);
  final CommandEvent event=SpongeEventFactory.createCommand(this.game,argSplit.length > 1 ? argSplit[1] : "String_Node_Str",source,argSplit[0],null);
  this.game.getEventManager().post(event);
  if (event.isCancelled()) {
    return event.getResult();
  }
  try {
    try {
      return this.dispatcher.process(source,commandLine);
    }
 catch (    InvocationCommandException ex) {
      if (ex.getCause() != null) {
        throw ex.getCause();
      }
    }
catch (    CommandPermissionException ex) {
      Text text=ex.getText();
      if (text != null) {
        source.sendMessage(error(text));
      }
    }
catch (    CommandException ex) {
      Text text=ex.getText();
      if (text != null) {
        source.sendMessage(error(text));
      }
      final Optional<CommandMapping> mapping=this.dispatcher.get(argSplit[0],source);
      if (mapping.isPresent()) {
        source.sendMessage(error(t("String_Node_Str",argSplit[0],mapping.get().getCallable().getUsage(source))));
      }
    }
  }
 catch (  Throwable thr) {
    TextBuilder excBuilder;
    if (thr instanceof TextMessageException) {
      Text text=((TextMessageException)thr).getText();
      excBuilder=text == null ? Texts.builder("String_Node_Str") : text.builder();
    }
 else {
      excBuilder=Texts.builder(String.valueOf(thr.getMessage()));
    }
    if (source.hasPermission("String_Node_Str")) {
      final StringWriter writer=new StringWriter();
      thr.printStackTrace(new PrintWriter(writer));
      excBuilder.onHover(TextActions.showText(Texts.of(writer.toString().replaceAll("String_Node_Str","String_Node_Str"))));
    }
    source.sendMessage(error(t("String_Node_Str",excBuilder.build())));
    this.log.error(Texts.toPlain(t("String_Node_Str",commandLine,source.toString(),thr.getMessage())),thr);
  }
  return Optional.of(CommandResult.empty());
}