I've run into a glitch while trying to run after a Rattata knocked out my Poochyena; it would say "Got away safely.", but then ask me again if I wanted to switch. After a few times, the Rattata used Tail Whip on nothing, and the error came up. I had to send out a Pokemon & then run.
Code:
Exception: undefined method `pbReduceStat' for nil:NilClass
PokeBattle_MoveEffects:203:in `pbEffect'
PokeBattle_Battler:1417:in `pbUseMove'
PokeBattle_Battler:1416:in `logonerr'
PokeBattle_Battler:1416:in `pbUseMove'
PokeBattle_Battler:1698:in `pbProcessTurn'
PokeBattle_Battler:1697:in `logonerr'
PokeBattle_Battler:1697:in `pbProcessTurn'
PokeBattle_Battle:2234:in `pbAttackPhase'
PokeBattle_Battle:2233:in `each'
PokeBattle_Battle:2233:in `pbAttackPhase'
PokeBattle_Battle:331:in `pbStartBattle'
PokeBattle_Battle:330:in `logonerr'
PokeBattle_Battle:330:in `pbStartBattle'
PokeBattle_Battle:315:in `loop'
PokeBattle_Battle:339:in `pbStartBattle'
PokemonField:169:in `pbWildBattle'
PokemonField:168:in `pbBattleAnimation'
PokemonField:168:in `pbWildBattle'
PokemonField:361:in `pbOnStepTaken'
Game_Player*:591:in `update_old'
Walk/Run:32:in `update'
Scene_Map:98:in `update'
Scene_Map:95:in `loop'
Scene_Map:108:in `update'
Scene_Map:64:in `main'
Scene_Map:61:in `loop'
Scene_Map:68:in `main'
Main:39:in `mainFunction'
Main:22:in `pbCriticalCode'
Main:42:in `mainFunction'
Main:46
Main:45:in `loop'
Main:54
EDIT: I also noticed a Bird Keeper trainer on Route 5 that has a male OW sprite, but a female Trainer sprite (noticable if one looks closely enough).