Navigation error

STACK TRACE
-----------------------------------------
function: NAV_main -- file: Navigation.lua line # 492 | MOD: Navigation

ERROR: General     , 1711084143965> ExceptionLogger.logException> Exception thrown java.lang.RuntimeException: Object tried to call nil in NAV_main at KahluaUtil.fail line:82.
ERROR: General     , 1711084143965> DebugLogStream.printException> Stack trace:
java.lang.RuntimeException: Object tried to call nil in NAV_main
	at se.krka.kahlua.vm.KahluaUtil.fail(KahluaUtil.java:82)
	at se.krka.kahlua.vm.KahluaThread.luaMainloop(KahluaThread.java:971)
	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:92)
	at zombie.gameStates.IngameState.updateInternal(IngameState.java:1624)
	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)
LOG  : General     , 1711084143966> -----------------------------------------