A player on our server received this error

attempted index: getTexture of non-table: null
function: addDynamicalContextMenu -- file: ISInventoryPaneContextMenu.lua line # 2839 | Vanilla
function: addDynamicalContextMenu -- file: ess.sac.events.lua line # 95 | MOD: ExtraSauce Sac
function: createMenu -- file: ISInventoryPaneContextMenu.lua line # 699 | Vanilla
function: createMenu -- file: exc_fix_food_bug.lua line # 84 | MOD: Excrementum
function: onRightMouseUp -- file: ISInventoryPane.lua line # 1444 | Vanilla
java.lang.RuntimeException: attempted index: getTexture 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.onRightMouseUp(UIElement.java:1458)
at zombie.ui.UIElement.onRightMouseUp(UIElement.java:1416)
at zombie.ui.UIManager.update(UIManager.java:910)
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)