warning if owner is not nearby

float LastTimeOwnerDetected;
key owner;

float fDISTANCE = 50.0; //meter

integer isAvatarNearby(key avatar, float distance)
{
    integer iCount;
    if (llGetAgentSize(avatar) != ZERO_VECTOR)
    { //avatar found
        vector vPos = llList2Vector(llGetObjectDetails(avatar, [OBJECT_POS]), 0);
        if (llVecDist(vPos, llGetPos()) <= distance)
        { //avatar is nearby
            return TRUE;
        }
        else
        {
            return FALSE;
        }
    }
    else
    {
        return FALSE;
    }
}
TellOwner( string Message )
{
   // llWhisper( 0, "Trace: " + Message );

    llInstantMessage(owner, (string)llGetPos() + " " + Message );
}

Init()
{
     owner = llGetOwner();
     LastTimeOwnerDetected = llGetTimeOfDay();
     llSetTimerEvent(30.0);
}

SelfDestructNow()
{
            llSay(0, "Too far from owner.  Self-destructing...");
            llInstantMessage(owner,"Too far from owner.  Self-destructing...");
            llDie();
}

default
{
    state_entry()
    {
        Init();
    }
    on_rez(integer start_param)
    {
        Init();
    }
    timer()
    {
        if (isAvatarNearby(owner, fDISTANCE))
        { //avatar detected
            LastTimeOwnerDetected = llGetTimeOfDay();
        }
        else
        {
            if( llGetTimeOfDay() - LastTimeOwnerDetected >= 60 )
            {
                //TellOwner( (string)llGetTimeOfDay() + " " + (string)LastTimeOwnerDetected );
                SelfDestructNow();
            }
            else if( llGetTimeOfDay() - LastTimeOwnerDetected >= 30 )
            {
                TellOwner( "Self destructing in 30 seconds..." );
            }
        }
    }
}