[Scenario]

Don't do it under OnPlayerStateChange. Try this:

pawn Код:

public OnPlayerEnterVehicle(playerid, vehicleid, ispassenger)
{
    switch(ispassenger)
    {
        case 1:
        {
            new
                curWeapon = GetPlayerWeapon(playerid);
            
            if(curWeapon != 28 || curWeapon != 29 || curWeapon != 32 || curWeapon != 31) SetPlayerArmedWeapon(playerid, 0);
        }
        default: SetPlayerArmedWeapon(playerid, 0);
    }       
    return 1;
}