[HELP] Server crash at code part

[gotiefan]

Hello.

void onPvpKill(Player* plr, Player* victim)
{
		QueryResult * CurrentKS = WorldDatabase.Query("SELECT * FROM killstreak WHERE playerid = '%u'", plr->GetGUID());
		QueryResult * VictimKS = WorldDatabase.Query("SELECT * FROM killstreak WHERE playerid = '%u'", victim->GetGUID());

		uint32 ks1 = 0;
		uint32 vks = 0;

		ks1 = CurrentKS->Fetch()[1].GetUInt32();
		vks = VictimKS->Fetch()[1].GetUInt32();
}

I've been coding some things, just to raise my knowledge. But when I try this code, and I kill a player it makes my server crash.

It has been working before without the Victim getGUID() part.

And if I remove vks = VictimKS->Fetch()[1].GetUInt32(); there is no crash, but I have no clue why it crashes the server?

Greetz,
GotenkZ

[gotiefan]

Someone?

Could really use some help :-)