[Maximus0]

Code:

//Somewhere on your gamemode (Not in any function/stock)
IsInMinigunArena[MAX_PLAYERS];

Code:

//OnPlayerCommandText
if (strcmp("/minigun", cmdtext, true, 10) == 0)
{
     IsInMinigunArena[playerid] = 1;
     SetPlayerPos(playerid, 00.0000, 00.0000, 00.0000);
     return 1;
}

Code:

//OnPlayerCommandText
if (strcmp("/goto", cmdtext, true, 10) == 0)
{
     if(IsInMinigunArena[playerid] != 0) return SendClientMessage(playerid, 0xFF0000C8, "You CANNOT Use This Command now!");

     //Your /goto code
     return 1;
}