Program: 162039
Project: 162039
Buggy source:
public void toggleKey(int keyCode,boolean isPressed){
  if (untoggle == false) {
    if (keyCode == KeyEvent.VK_W || keyCode == KeyEvent.VK_UP) {
      getUp().toggle(isPressed);
    }
    if (keyCode == KeyEvent.VK_S || keyCode == KeyEvent.VK_DOWN) {
      getDown().toggle(isPressed);
    }
    if (keyCode == KeyEvent.VK_A || keyCode == KeyEvent.VK_LEFT) {
      getLeft().toggle(isPressed);
    }
    if (keyCode == KeyEvent.VK_D || keyCode == KeyEvent.VK_RIGHT) {
      getRight().toggle(isPressed);
    }
  }
 else {
    getUp().toggle(false);
    getDown().toggle(false);
    getLeft().toggle(false);
    getRight().toggle(false);
  }
  if (keyCode == KeyEvent.VK_M) {
    this.setPlayMusic(true);
  }
  if (keyCode == KeyEvent.VK_Z) {
    if (Game.getMap() == 2) {
      Game.setChangeLevel(true);
      Game.getLevel().removeEntity(Game.getDummy());
      Game.setNpc(false);
    }
  }
  if (keyCode == KeyEvent.VK_N) {
    if (Game.isNpc() == false) {
      Game.setNpc(true);
      Game.npcSpawn();
      print.print("String_Node_Str",PrintTypes.GAME);
    }
  }
  if (keyCode == KeyEvent.VK_K) {
    if (Game.isNpc() == true) {
      Game.setNpc(false);
      Game.npcKill();
      print.print("String_Node_Str",PrintTypes.GAME);
    }
  }
  if (keyCode == KeyEvent.VK_Q) {
    Game.setClosing(true);
    try {
      Thread.sleep(1000);
    }
 catch (    InterruptedException e) {
      e.printStackTrace();
    }
    Game.getLevel().removeEntity(Game.getPlayer().getSantizedUsername());
    Game.setRunning(false);
    Game.getFrame().dispose();
    System.exit(1);
  }
  if (keyCode == KeyEvent.VK_BACK_QUOTE) {
    if (Game.isClosing() == false && Game.isDevMode() == false) {
      Game.setDevMode(true);
      new Thread(new SleepThread());
    }
  }
}

Fixed version (ground truth):
public void toggleKey(int keyCode,boolean isPressed){
  if (isIgnoreInput() == false) {
    if (keyCode == KeyEvent.VK_W || keyCode == KeyEvent.VK_UP) {
      getUp().toggle(isPressed);
    }
    if (keyCode == KeyEvent.VK_S || keyCode == KeyEvent.VK_DOWN) {
      getDown().toggle(isPressed);
    }
    if (keyCode == KeyEvent.VK_A || keyCode == KeyEvent.VK_LEFT) {
      getLeft().toggle(isPressed);
    }
    if (keyCode == KeyEvent.VK_D || keyCode == KeyEvent.VK_RIGHT) {
      getRight().toggle(isPressed);
    }
  }
  if (isIgnoreInput() == true) {
    getUp().toggle(false);
    getDown().toggle(false);
    getLeft().toggle(false);
    getRight().toggle(false);
  }
  if (keyCode == KeyEvent.VK_M) {
    this.setPlayMusic(true);
  }
  if (keyCode == KeyEvent.VK_Z) {
    if (Game.getMap() == 2) {
      Game.setChangeLevel(true);
      Game.getLevel().removeEntity(Game.getDummy());
      Game.setNpc(false);
    }
  }
  if (keyCode == KeyEvent.VK_N) {
    if (Game.getPlayer().isMoving()) {
      setIgnoreInput(true);
      int n=popup.Warn("String_Node_Str");
      if (n == 0) {
        setIgnoreInput(false);
      }
      return;
    }
    if (Game.isNpc() == false) {
      Game.setNpc(true);
      Game.npcSpawn();
      print.print("String_Node_Str",PrintTypes.GAME);
    }
  }
  if (keyCode == KeyEvent.VK_K) {
    if (Game.isNpc() == true) {
      Game.setNpc(false);
      Game.npcKill();
      print.print("String_Node_Str",PrintTypes.GAME);
    }
  }
  if (keyCode == KeyEvent.VK_Q) {
    Game.setClosing(true);
    try {
      Thread.sleep(1000);
    }
 catch (    InterruptedException e) {
      e.printStackTrace();
    }
    Game.getLevel().removeEntity(Game.getPlayer().getSantizedUsername());
    Game.setRunning(false);
    Game.getFrame().dispose();
    System.exit(1);
  }
  if (keyCode == KeyEvent.VK_BACK_QUOTE) {
    if (Game.isClosing() == false && Game.isDevMode() == false) {
      Game.setDevMode(true);
      new Thread(new SleepThread());
    }
  }
}