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`attempted index: getFullType of non-table: null
function: GetOrCreateWeaponModData -- file: FMR_API.lua line # 182 | MOD: Firearms Maintenance Redux
function: GetOrCreateWeaponModData -- file: FMR_Client.lua line # 310 | MOD: Firearms Maintenance Redux
function: ReduceQualityCondtionForRandomPart -- file: FMR_Client.lua line # 203 | MOD: Firearms Maintenance Redux
function: UpdateConditionAndQuality -- file: FMR_GunConditionHandler.lua line # 14 | MOD: Firearms Maintenance Redux
function: OnPlayerAttackFinished -- file: FMR_GunConditionHandler.lua line # 20 | MOD: Firearms Maintenance Redux
java.lang.RuntimeException: attempted index: getFullType 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:134)
at zombie.ai.states.SwipeStatePlayer.exit(SwipeStatePlayer.java:543)
at zombie.ai.StateMachine.stateExit(StateMachine.java:249)
at zombie.ai.StateMachine.removeSubstate(StateMachine.java:167)
at zombie.ai.StateMachine.lambda$changeState$2(StateMachine.java:62)
at zombie.util.lambda.Consumers$Params1$CallbackStackItem.accept(Consumers.java:39)
at zombie.util.list.PZArrayUtil.forEach(PZArrayUtil.java:904)
at zombie.util.Lambda.lambda$forEachFrom$2(Lambda.java:201)
at zombie.util.lambda.Stacks$Params4$CallbackStackItem.invoke(Stacks.java:286)
at zombie.util.lambda.Stacks$GenericStack.invokeAndRelease(Stacks.java:26)
at zombie.util.Lambda.capture(Lambda.java:136)
at zombie.util.Lambda.forEachFrom(Lambda.java:198)
at zombie.ai.StateMachine.changeState(StateMachine.java:58)
at zombie.ai.StateMachine.changeState(StateMachine.java:32)
at zombie.characters.IsoGameCharacter.actionStateChanged(IsoGameCharacter.java:13858)
at zombie.characters.IsoPlayer.actionStateChanged(IsoPlayer.java:8966)
at zombie.characters.action.ActionContext.invokeAnyStateChangedEvents(ActionContext.java:433)
at zombie.characters.action.ActionContext.updateInternal(ActionContext.java:83)
at zombie.util.lambda.Invokers$Params1$CallbackStackItem.run(Invokers.java:37)
at zombie.core.profiling.AbstractPerformanceProfileProbe.invokeAndMeasure(AbstractPerformanceProfileProbe.java:71)
at zombie.core.profiling.AbstractPerformanceProfileProbe.lambda$invokeAndMeasure$0(AbstractPerformanceProfileProbe.java:83)
at zombie.util.lambda.Stacks$Params3$CallbackStackItem.invoke(Stacks.java:230)
at zombie.util.lambda.Stacks$GenericStack.invokeAndRelease(Stacks.java:26)
at zombie.util.Lambda.capture(Lambda.java:130)
at zombie.core.profiling.AbstractPerformanceProfileProbe.invokeAndMeasure(AbstractPerformanceProfileProbe.java:81)
at zombie.characters.action.ActionContext.update(ActionContext.java:66)
at zombie.characters.IsoGameCharacter.postUpdateInternal(IsoGameCharacter.java:12084)
at zombie.util.lambda.Invokers$Params1$CallbackStackItem.run(Invokers.java:37)
at zombie.core.profiling.AbstractPerformanceProfileProbe.invokeAndMeasure(AbstractPerformanceProfileProbe.java:71)
at zombie.core.profiling.AbstractPerformanceProfileProbe.lambda$invokeAndMeasure$0(AbstractPerformanceProfileProbe.java:83)
at zombie.util.lambda.Stacks$Params3$CallbackStackItem.invoke(Stacks.java:230)
at zombie.util.lambda.Stacks$GenericStack.invokeAndRelease(Stacks.java:26)
at zombie.util.Lambda.capture(Lambda.java:130)
at zombie.core.profiling.AbstractPerformanceProfileProbe.invokeAndMeasure(AbstractPerformanceProfileProbe.java:81)
at zombie.characters.IsoGameCharacter.postupdate(IsoGameCharacter.java:12063)
at zombie.characters.IsoPlayer.postupdateInternal(IsoPlayer.java:3740)
at zombie.util.lambda.Invokers$Params1$CallbackStackItem.run(Invokers.java:37)
at zombie.core.profiling.AbstractPerformanceProfileProbe.invokeAndMeasure(AbstractPerformanceProfileProbe.java:71)
at zombie.core.profiling.AbstractPerformanceProfileProbe.lambda$invokeAndMeasure$0(AbstractPerformanceProfileProbe.java:83)
at zombie.util.lambda.Stacks$Params3$CallbackStackItem.invoke(Stacks.java:230)
at zombie.util.lambda.Stacks$GenericStack.invokeAndRelease(Stacks.java:26)
at zombie.util.Lambda.capture(Lambda.java:130)
at zombie.core.profiling.AbstractPerformanceProfileProbe.invokeAndMeasure(AbstractPerformanceProfileProbe.java:81)
at zombie.characters.IsoPlayer.postupdate(IsoPlayer.java:3733)
at zombie.MovingObjectUpdateSchedulerUpdateBucket.postupdate(MovingObjectUpdateSchedulerUpdateBucket.java:97)
at zombie.MovingObjectUpdateScheduler.postupdate(MovingObjectUpdateScheduler.java:168)
at zombie.CollisionManager.resolveContactsInternal(CollisionManager.java:411)
at zombie.util.lambda.Invokers$Params1$CallbackStackItem.run(Invokers.java:37)
at zombie.core.profiling.AbstractPerformanceProfileProbe.invokeAndMeasure(AbstractPerformanceProfileProbe.java:71)
at zombie.core.profiling.AbstractPerformanceProfileProbe.lambda$invokeAndMeasure$0(AbstractPerformanceProfileProbe.java:83)
at zombie.util.lambda.Stacks$Params3$CallbackStackItem.invoke(Stacks.java:230)
at zombie.util.lambda.Stacks$GenericStack.invokeAndRelease(Stacks.java:26)
at zombie.util.Lambda.capture(Lambda.java:130)
at zombie.core.profiling.AbstractPerformanceProfileProbe.invokeAndMeasure(AbstractPerformanceProfileProbe.java:81)
at zombie.CollisionManager.ResolveContacts(CollisionManager.java:236)
at zombie.iso.IsoWorld.updateInternal(IsoWorld.java:3502)
at zombie.util.lambda.Invokers$Params1$CallbackStackItem.run(Invokers.java:37)
at zombie.core.profiling.AbstractPerformanceProfileProbe.invokeAndMeasure(AbstractPerformanceProfileProbe.java:71)
at zombie.core.profiling.AbstractPerformanceProfileProbe.lambda$invokeAndMeasure$0(AbstractPerformanceProfileProbe.java:83)
at zombie.util.lambda.Stacks$Params3$CallbackStackItem.invoke(Stacks.java:230)
at zombie.util.lambda.Stacks$GenericStack.invokeAndRelease(Stacks.java:26)
at zombie.util.Lambda.capture(Lambda.java:130)
at zombie.core.profiling.AbstractPerformanceProfileProbe.invokeAndMeasure(AbstractPerformanceProfileProbe.java:81)
at zombie.iso.IsoWorld.update(IsoWorld.java:3427)
at zombie.gameStates.IngameState.updateInternal(IngameState.java:1617)
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:681)
at zombie.GameWindow.mainThread(GameWindow.java:495)
at java.base/java.lang.Thread.run(Unknown Source)
`

I had the exact same error. I was able to solve my problem idk if my fix will help yours could be a different situation. My server provider likes to auto place my mod IDs sometimes and does it incorrectly I'm constantly going in with errors and fixing it manually. In this case i needed the core mod ID “FirearmsMaintenanceRedux“ and the sub next in the list “FirearmsMaintenanceRedux_Guns93” originally the core mod was incorrectly entered and was not present causing the weapon inspection error to be produced “sometimes” or no inspection at all occurred.

Since this appears as though it's never going to be fixed, everybody can use the following patch mod:
"BasedFirearmsMaintenanceReduxFix"