Program: 179005
Project: 179005
Buggy source:
private void loginCheck(PlayerLoginEvent event){
  PermissionUser user;
  if (!BenCmd.getPermissionManager().getUserFile().userExists(event.getPlayer().getName())) {
    if (BenCmd.getMainProperties().getBoolean("String_Node_Str",false)) {
      event.disallow(Result.KICK_WHITELIST,BenCmd.getMainProperties().getString("String_Node_Str","String_Node_Str"));
      return;
    }
 else {
      BenCmd.getPermissionManager().getUserFile().addUser(user=PermissionUser.newUser(event.getPlayer().getName(),new ArrayList<String>()));
    }
  }
 else {
    user=PermissionUser.matchUser(event.getPlayer().getName());
  }
  if (BenCmd.getPermissionManager().getGroupFile().getAllUserGroups(user).isEmpty()) {
    BenCmd.getPermissionManager().getGroupFile().getGroup(BenCmd.getMainProperties().getString("String_Node_Str","String_Node_Str")).addUser(user);
  }
  if ((User.getUser(event.getPlayer())).isBanned() != null) {
    event.disallow(Result.KICK_BANNED,"String_Node_Str");
    return;
  }
  long timeLeft;
  if ((timeLeft=BenCmd.getPermissionManager().getKickTracker().isBlocked(event.getPlayer().getName())) > 0) {
    event.disallow(Result.KICK_OTHER,"String_Node_Str" + String.valueOf((int)Math.ceil(timeLeft / 60000.0)) + "String_Node_Str");
    return;
  }
switch (BenCmd.getPermissionManager().getMaxPlayerHandler().join(User.getUser(event.getPlayer()))) {
case NO_SLOT_NORMAL:
    event.disallow(Result.KICK_FULL,BenCmd.getMainProperties().getString("String_Node_Str","String_Node_Str"));
  break;
case NO_SLOT_RESERVED:
event.disallow(Result.KICK_FULL,BenCmd.getMainProperties().getString("String_Node_Str","String_Node_Str"));
break;
}
User.finalizeUser(User.getUser(event.getPlayer()));
}

Fixed version (ground truth):
private void loginCheck(PlayerLoginEvent event){
  PermissionUser user;
  if (!BenCmd.getPermissionManager().getUserFile().userExists(event.getPlayer().getName())) {
    if (BenCmd.getMainProperties().getBoolean("String_Node_Str",false)) {
      event.disallow(Result.KICK_WHITELIST,BenCmd.getMainProperties().getString("String_Node_Str","String_Node_Str"));
      return;
    }
 else {
      BenCmd.getPermissionManager().getUserFile().addUser(user=PermissionUser.newUser(event.getPlayer().getName(),new ArrayList<String>()));
    }
  }
 else {
    user=PermissionUser.matchUserIgnoreCase(event.getPlayer().getName());
    if (!user.getName().equals(event.getPlayer().getName())) {
      BenCmd.log(Level.WARNING,"String_Node_Str" + user.getName() + "String_Node_Str"+ event.getPlayer().getName());
      BenCmd.getPermissionManager().getUserFile().correctCase(user,event.getPlayer().getName());
    }
  }
  if (BenCmd.getPermissionManager().getGroupFile().getAllUserGroups(user).isEmpty()) {
    BenCmd.getPermissionManager().getGroupFile().getGroup(BenCmd.getMainProperties().getString("String_Node_Str","String_Node_Str")).addUser(user);
  }
  if ((User.getUser(event.getPlayer())).isBanned() != null) {
    event.disallow(Result.KICK_BANNED,"String_Node_Str");
    return;
  }
  long timeLeft;
  if ((timeLeft=BenCmd.getPermissionManager().getKickTracker().isBlocked(event.getPlayer().getName())) > 0) {
    event.disallow(Result.KICK_OTHER,"String_Node_Str" + String.valueOf((int)Math.ceil(timeLeft / 60000.0)) + "String_Node_Str");
    return;
  }
switch (BenCmd.getPermissionManager().getMaxPlayerHandler().join(User.getUser(event.getPlayer()))) {
case NO_SLOT_NORMAL:
    event.disallow(Result.KICK_FULL,BenCmd.getMainProperties().getString("String_Node_Str","String_Node_Str"));
  break;
case NO_SLOT_RESERVED:
event.disallow(Result.KICK_FULL,BenCmd.getMainProperties().getString("String_Node_Str","String_Node_Str"));
break;
}
User.finalizeUser(User.getUser(event.getPlayer()));
}