exception on route 2 rocky field

[CrossImpact 107]

happened during a battle against a wild Pokemon on Route 2.

Noivern (trainer) vs Noctowl (wild)

let Noivern use Air Slash, caused Noctowl to crash into the rocks
tried to reproduce it without success.

Exception: NameError
Message: undefined local variable or method `user' for #<PokeBattle_Battler:0x1094b2f8>
PokeBattle_Battler:3244:in `pbTryUseMove'
PokeBattle_Battler:3609:in `pbUseMove'
PokeBattle_Battler:4621:in `pbProcessTurn'
PokeBattle_Battler:4620:in `logonerr'
PokeBattle_Battler:4620:in `pbProcessTurn'
PokeBattle_Battle:3706:in `pbAttackPhase'
PokeBattle_Battle:3705:in `each'
PokeBattle_Battle:3705:in `pbAttackPhase'
PokeBattle_Battle:3422:in `pbStartBattleCore'
PokeBattle_Battle:3421:in `logonerr'