[Skimmer]

You cannot use a string inside an array variable.

Use id instead reciever.

I also noticed another Bug. In fact you're trying to read the targetname, before checking sscanf.

pawn Код:

GetPlayerName(id,recievername,sizeof(recievername));

Should stay below sscanf.

This is right

pawn Код:

if(sscanf(params, "u", id)) return SendClientMessage(playerid, COLOR_RED,"[USAGE] - /stats [ID]");
GetPlayerName(id,recievername,sizeof(recievername));