Problem *FIX*

//Use DestroyPickupEx if you want to destroy a pickup!

//News
new Float:PickupPos[MAX_PICKUPS][3], Pickups = 0, outsidefront, outsideback, insideback, insidefront;

//Forward
forward Check();

//Stocks
stock CreatePickupEx(model, type, Float:X, Float:Y, Float:Z, Virtualworld)
{
    new pickupid = CreatePickup(model, type, Float:X, Float:Y, Float:Z, Virtualworld);
    Pickups++;
    PickupPos[pickupid][0] = X;
    PickupPos[pickupid][1] = Y;
    PickupPos[pickupid][2] = Z;
    return pickupid;
}

stock DestroyPickupEx(pickup)
{
    DestroyPickup(pickup);
    Pickups--;
    for(new i = 0; i < 3; i++) PickupPos[pickupid][i] = 0.0;
}

//Publics
public Check()
{
    for(new playerid = 0; playerid < MAX_PLAYERS; playerid++)
    {
        if(IsPlayerConnected(playerid))
        {
            new bool:pickupcheck = false;
            for(new i = 0; i < Pickups; i++) if(IsPlayerInRangeOfPoint(playerid, 4.0, PickupPos[i][0], PickupPos[i][1], PickupPos[2])) pickupcheck = true;
            if(!pickupcheck) SetPVarInt(playerid, "PickupID", -1);
        }
    }
}

Public OnGameModeInit()
{
    //Pickups
    outsidefront = CreatePickupEx(1318,23,2131.8494,-1151.0961,24.0855,-1);
    outsideback = CreatePickupEx(1318,23,2124.0605,-1169.6489,24.1428,-1);
    insideback = CreatePickupEx(1318,23,2128.6238,-1165.9609,13.7360,-1);
    insidefront = CreatePickupEx(1318,23,2130.0591, -1155.0420, 13.7360,-1);
    SetTimer("Check", 500, true);
}

public OnPlayerConnect(playerid)
{
    SetPVarInt(playerid, "PickupID", -1);
    return 1;
}

public OnPlayerPickUpPickup(playerid, pickupid)
{
    if(pickupid == outsidefront || pickupid == outsideback || pickupid == insidefront || pickupid == insideback) SetPVarInt(playerid, "PickupID", pickupid);
    return 1;
}

public OnPlayerKeyStateChange(playerid, newkeys, oldkeys)
{
    if((newkeys & KEY_SECONDARY_ATTACK) &&! (oldkeys & KEY_SECONDARY_ATTACK))
    {
        if(GetPVarInt(playerid, "PickupID") == outsidefront)
        {
            SetPlayerInterior(playerid, 1);
            SetPlayerPos(playerid, 2130.0591, -1155.0420, 13.7360);
            SetPVarInt(playerid, "PickupID", -1);
        }
        else if(GetPVarInt(playerid, "PickupID") == outsideback)
        {
            SetPlayerInterior(playerid, 1);
            SetPlayerPos(playerid, 2128.6238, -1165.9609, 13.7360);
            SetPVarInt(playerid, "PickupID", -1);
        }
        else if(GetPVarInt(playerid, "PickupID") == insidefront)
        {
            SetPlayerInterior(playerid, 0);
            SetPlayerPos(playerid, 2131.8494, -1151.0961, 24.0855);
            SetPVarInt(playerid, "PickupID", -1);
        }
        else if(GetPVarInt(playerid, "PickupID") == insideback)
        {
            SetPlayerInterior(playerid, 0);
            SetPlayerPos(playerid, 2124.0605, -1169.6489, 24.1428);
            SetPVarInt(playerid, "PickupID", -1);
        }
    }
    return 1;
}