Attempting to exercise gives me this errror;

`attempted index: getBodyLocation of non-table: null
function: unequipItem -- file: P4Excalibolg.lua line # 200 | MOD: Excalibolg
function: equipItems -- file: FWOFitnessWorkoutOverhaulUI.lua line # 7 | MOD: FWO Fitness Workout Overhaul
function: onClick -- file: ISFitnessUI.lua line # 331 | Vanilla
function: onMouseUp -- file: ISButton.lua line # 56 | Vanilla
java.lang.RuntimeException: attempted index: getBodyLocation of non-table: null
at se.krka.kahlua.vm.KahluaThread.tableget(KahluaThread.java:1689)
at se.krka.kahlua.vm.KahluaThread.luaMainloop(KahluaThread.java:641)
at se.krka.kahlua.vm.KahluaThread.call(KahluaThread.java:163)
at se.krka.kahlua.vm.KahluaThread.pcall(KahluaThread.java:1980)
at se.krka.kahlua.vm.KahluaThread.pcallBoolean(KahluaThread.java:1924)
at se.krka.kahlua.integration.LuaCaller.protectedCallBoolean(LuaCaller.java:104)
at zombie.ui.UIElement.onMouseUp(UIElement.java:1228)
at zombie.ui.UIElement.onMouseUp(UIElement.java:1183)
at zombie.ui.UIManager.update(UIManager.java:816)
at zombie.GameWindow.logic(GameWindow.java:262)
at zombie.core.profiling.AbstractPerformanceProfileProbe.invokeAndMeasure(AbstractPerformanceProfileProbe.java:71)
at zombie.GameWindow.frameStep(GameWindow.java:765)
at zombie.GameWindow.run_ez(GameWindow.java:681)
at zombie.GameWindow.mainThread(GameWindow.java:495)
at java.base/java.lang.Thread.run(Unknown Source)
`