`attempted index: getUsername of non-table: null
function: Advanced_trajectory_OnServerCommand -- file: Advanced_trajectory_clientdeal.lua line # 51 | MOD: Advanced Trajectory's Realistic Overhaul
java.lang.RuntimeException: attempted index: getUsername 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.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:173)
at zombie.network.GameClient.receiveClientCommand(GameClient.java:1513)
at zombie.network.PacketTypes$PacketType.onMainLoopHandlePacketInternal(PacketTypes.java:1028)
at zombie.network.GameClient.mainLoopHandlePacketInternal(GameClient.java:644)
at zombie.network.GameClient.mainLoopDealWithNetData(GameClient.java:621)
at zombie.network.GameClient.update(GameClient.java:431)
at zombie.GameWindow.logic(GameWindow.java:232)
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)
`