[New and Clueless]

L 02/02/2016 - 20:47:13: [AMXX] Displaying debug trace (plugin "sh_a_tracker.amxx")
L 02/02/2016 - 20:47:13: [AMXX] Run time error 4: index out of bounds 
L 02/02/2016 - 20:47:13: [AMXX]    [0] sh_a_tracker.sma::tracker_damage (line 109)
L 02/02/2016 - 20:47:13: Invalid player id 97

i always get this when im on a certain map

error part of the code: 

public tracker_damage(id)
{
  new victim = id
  new attacker = get_user_attacker(victim)
  new maxTargets = get_cvar_num("tracker_maxtargets")
  
  if(maxTargets == 0)
    maxTargets = 32
  
  if(hasTrackerPowers[attacker] && attacker!=victim && get_user_team(attacker)!=get_user_team(victim) && numTargets[attacker]<maxTargets)
  {
    isTagged[attacker][victim] = true
    numTargets[attacker] = numTargets[attacker]++
    timeLeft[attacker][victim] = get_cvar_float("tracker_timetargeted")
    if(timeLeft[attacker][victim]==0.0)
      timeLeft[attacker][victim] = -1.0
  }
}