Num Players in Session isn't refreshed?

Development Programming & Scripting
5

This doesn’t work for me, as I get negative player count numbers (such as -17). The code I used is the same, except that being already in GameMode I do not go through world:

void AMST_GameMode::PostLogin(APlayerController* NewPlayer)
{
	Super::PostLogin(NewPlayer);

	if (GameSession)
	{
		FJoinabilitySettings OutSettings;
		GameSession->GetSessionJoinability(GameSessionName, OutSettings);

		GameSession->UpdateSessionJoinability(GameSessionName,
			OutSettings.bPublicSearchable, OutSettings.bAllowInvites,
			OutSettings.bJoinViaPresence, OutSettings.bJoinViaPresenceFriendsOnly);
	}
}

Any ideas?