Loading the game while you are doing a dungeon without the 'Dungeon Equipment Swapping' upgrade results in the following error:
7e2dce15-1c65-4f00-9198-4a0aea6c6ec2:279 MICSR: TypeError: Cannot read property 'equipment' of undefined
at SimPlayer.get equipment [as equipment] (player.js?6124:11)
at SimPlayer.computeAttackType (player.js?6124:316)
at App.updateSpellOptions (5147153e-b878-45fc-af45-88d22c3dbede:2463)
at App.updateUi (5147153e-b878-45fc-af45-88d22c3dbede:333)
at App.<anonymous> (5147153e-b878-45fc-af45-88d22c3dbede:324)
at Generator.next (<anonymous>)
at fulfilled (language.js?6124:2)
This prevents this mod from functioning.