`function: GFreplaceItem -- file: GFtimetracker.lua line # 70 | MOD: jigga's Green Fire Mod
function: GFContainerHandle -- file: GFtimetracker.lua line # 151 | MOD: jigga's Green Fire Mod
function: GFItemCheck -- file: GFtimetracker.lua line # 269 | MOD: jigga's Green Fire Mod
java.lang.RuntimeException: __sub not defined for operands in GFreplaceItem
at se.krka.kahlua.vm.KahluaUtil.fail(KahluaUtil.java:82)
at se.krka.kahlua.vm.KahluaThread.luaMainloop(KahluaThread.java:676)
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.pcallvoid(KahluaThread.java:1812)
at se.krka.kahlua.integration.LuaCaller.pcallvoid(LuaCaller.java:66)
at se.krka.kahlua.integration.LuaCaller.protectedCallVoid(LuaCaller.java:139)
at zombie.Lua.Event.trigger(Event.java:64)
at zombie.Lua.LuaEventManager.triggerEvent(LuaEventManager.java:65)
at zombie.GameTime.update(GameTime.java:637)
at zombie.gameStates.IngameState.UpdateStuff(IngameState.java:566)
at zombie.gameStates.IngameState.updateInternal(IngameState.java:1623)
at zombie.gameStates.IngameState.update(IngameState.java:1333)
at zombie.gameStates.GameStateMachine.update(GameStateMachine.java:101)
at zombie.GameWindow.logic(GameWindow.java:298)
at zombie.core.profiling.AbstractPerformanceProfileProbe.invokeAndMeasure(AbstractPerformanceProfileProbe.java:71)
at zombie.GameWindow.frameStep(GameWindow.java:765)
at zombie.GameWindow.run_ez(GameWindow.java:667)
at zombie.GameWindow.mainThread(GameWindow.java:495)
at java.base/java.lang.Thread.run(Unknown Source)
`

@Acey is the error I was getting, not sure if that helps you figure out if that's being caused by the time tracker code or not! posted it in a discussion topic since it was too long for a comment