Knock back damage being applied twice crash?

Traceback (most recent call last):
  File "otp.otpbase.OTPBase", line 233, in run
  File "direct.task.Task", line 514, in run
  File "direct.task.Task", line 468, in step
  File "direct.distributed.ConnectionRepository", line 609, in readerPollUntilEmpty
  File "direct.distributed.ConnectionRepository", line 616, in readerPollOnce
  File "otp.distributed.OTPClientRepository", line 1853, in handleDatagram
  File "otp.distributed.OTPClientRepository", line 1471, in handlePlayGame
  File "direct.distributed.ClientRepositoryBase", line 437, in handleUpdateField
  File "direct.distributed.ClientRepositoryBase", line 445, in __doUpdate
  File "toontown.battle.DistributedBattleBase", line 339, in setState
  File "direct.fsm.ClassicFSM", line 281, in request
  File "direct.fsm.ClassicFSM", line 228, in __transition
  File "direct.fsm.ClassicFSM", line 214, in __enter
  File "direct.fsm.State", line 202, in enter
  File "toontown.battle.DistributedBattleBase", line 1043, in enterWaitForInput
  File "toontown.battle.DistributedBattleBase", line 1010, in __enterLocalToonWaitForInput
  File "toontown.town.TownBattle", line 194, in setState
  File "direct.fsm.ClassicFSM", line 281, in request
  File "direct.fsm.ClassicFSM", line 227, in __transition
  File "direct.fsm.ClassicFSM", line 185, in __exitCurrent
  File "direct.fsm.State", line 213, in exit
  File "toontown.town.TownBattle", line 323, in exitOff
  File "toontown.town.TownBattle", line 207, in __cogPanels
  File "toontown.town.TownBattleCogPanel", line 109, in show
  File "toontown.town.TownBattleCogPanel", line 98, in updateHealthBar
IndexError: tuple index out of range