[Error] AI breaks when trying to strategically switch out another monster during battle [v19]

I was doing a double battle with a boss in my game, and I think they tried to switch out their monster for another one; however, instead of switching out, an error appeared and gave me a free turn to attack. Here is the error, if there is anything that I need to fix I would love to know! Thanks in advance, and have a good one!
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[Pokemon Essentials version 19]
[v19 Hotfixes 1.0.6]

Exception: ArgumentError
Message: comparison of Symbol with 0 failed

Backtrace:
187:AI_Switch:110:in `>='
187:AI_Switch:110:in `block in pbEnemyShouldWithdrawEx?'
187:AI_Switch:94:in `each'
187:AI_Switch:94:in `each_with_index'
187:AI_Switch:94:in `pbEnemyShouldWithdrawEx?'
187:AI_Switch:6:in `pbEnemyShouldWithdraw?'
207:PokeBattle_BattlePalace:193:in `pbEnemyShouldWithdraw?'
208:PokeBattle_BattleArena:178:in `pbEnemyShouldWithdraw?'
185:PokeBattle_AI:64:in `pbDefaultChooseEnemyCommand'
180:Battle_Phase_Command:200:in `block in pbCommandPhaseLoop'
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(I can try my best to supply any information you may need, but do know that the whole script should not have been tampered with yet!)

This has been fixed. Get Essentials v19.1 along with the v19.1 Hotfixes.

Good to know! Thanks for the headsup!