[Error] Game crashes when sending out a Pokémon

This happens when it's time for me to send out my Pokémon at the start of a battle

[Pokémon Essentials version 20.1]

[v20.1 Hotfixes 1.0.7]

Script error in event 5 (coords 24,34), map 106 (starting town)

Exception: NoMethodError

Message: undefined method `width' for nil:NilClass

***Full script:

TrainerBattle.start(:ASSISTANT, "Maria")

Backtrace:

193:Battle_Scene_BaseAnimation:105:in `ballTracksHand'

194:Battle_Scene_Animations:446:in `createProcesses'

193:Battle_Scene_BaseAnimation:12:in `initialize'

194:Battle_Scene_Animations:416:in `initialize'

190:Scene_PlayAnimations:122:in `new'

190:Scene_PlayAnimations:122:in `block in pbSendOutBattlers'

190:Scene_PlayAnimations:112:in `each'

190:Scene_PlayAnimations:112:in `each_with_index'

190:Scene_PlayAnimations:112:in `pbSendOutBattlers'

151:Battle_ActionSwitching:290:in `pbSendOut'