TFS 1.X+ Tfs 1.x Error when add player in vip

[roriscrave]

My server is possible to log 2 players on the same account.
for example, the account has 2 players:
Player A and Player B.

Reproducing a bug:
All players from this account are online (player A and player B).
Player A add Player C in your vip.
PLayer B add Player C in your vip.

as the vip list is the same for players on the same account, the error occurs

[Error - mysql_real_query] Query: INSERT INTO `account_viplist` (`account_id`, `player_id`) VALUES (476,1010)
Message: Duplicate entry '476-1010' for key 'account_player_index'

code:
iologindata.cpp

void IOLoginData::addVIPEntry(uint32_t accountId, uint32_t guid)
{
    Database& db = Database::getInstance();

    std::ostringstream query;
    query << "INSERT INTO `account_viplist` (`account_id`, `player_id`) VALUES (" << accountId << ',' << guid << ')';
    db.executeQuery(query.str());
}

player.cpp

bool Player::addVIP(uint32_t vipGuid, const std::string& vipName, VipStatus_t status)
{
    if (VIPList.size() >= getMaxVIPEntries() || VIPList.size() == 200) { // max number of buddies is 200 in 9.53
        sendTextMessage(MESSAGE_STATUS_SMALL, "You cannot add more buddies.");
        return false;
    }

    auto result = VIPList.insert(vipGuid);
    if (!result.second) {
        sendTextMessage(MESSAGE_STATUS_SMALL, "This player is already in your list.");
        return false;
    }

    IOLoginData::addVIPEntry(accountNumber, vipGuid);
    if (client) {
        client->sendVIP(vipGuid, vipName, status);
    }
    return true;
}

 

[Gesior.pl]

This database schema and server code does not allow to login 2 players from same account in same time.

 

[roriscrave]

This database schema and server code does not allow to login 2 players from same account in same time.

I use it this way for a long time, the only problem I have until today is that of the vip list.
I thought it would be possible to fix it.
but apparently there is no correction, due to the structure that was not made to work this way

 

[ralke]

This error appeared for me today. What is this about? Using TFS 1.5 downgraded by Nekiro (8.60)
Is this a critical error? Something to care about? I understand what gesior said, but I want to be sure that I shouldn't be warned about it.