Disconnecting: NullReferenceException: Object reference not set to an instance of an objectSolved

https://i.imgur.com/fdMT7Xr.png

Players on my server are getting disconnected with this error.  The screenshot linked above is what I see in the server console.
Plugins in use are as follows:
     Backpacks.cs
     BetterLoot.cs
     BotSpawn.cs  (650 bots, though it has happened with far less)
     DeathNotes.cs
     EventRandomizer.cs
     FurnaceSplitter.cs
     GatherManager.cs
     HealthyGuns.cs
     Inbound.cs
     InfoPanel.cs
     IngameClockGUI.cs
     InstantCraft.cs
     KillReward.cs
     Kits.cs
     LootBouncer.cs
     MyMiniCopter.cs
     NoRespawnCooldowns.cs
     NoWorkbench.cs
     NTeleportation.cs
     QuickSmelt.cs
     StackSizeController.cs
     TimeOfDay.cs
     Trade.cs

It's kind of a private server, so there is a max of 2 players and both of us are crashing in-game with the same error at the same time.
Looking around, this error seems to have happened over the last several years with either non-existent or temporary fixes.

Both the game and Oxide are up-to-date.

Seems like one of the bots are trying to shoot something which fails and times you out.
Quapi, if that were the case, it wouldn't matter how many bots there were.  If that's what's happening, the issue is with the plugin.  However, I have no way of narrowing it down unless I unloaded the BotSpawn plugin altogether and just waited, as it's completely random.
Having said that, where I've found others having this issue doesn't seem to revolve around the plugin at all.
Hey,
Quapi is right; Some npc is trying to fire (or use) something that's not working.
Pretty sure this happens if you get an npc to fire a rocket but I expect there are other things that can cause it to.

I'd go through the kits you're giving to your npcs and remove everything from the belts except for bullet projectile weapons, and hand tools/melee weapons.
That makes sense now.  I've got one kit that uses the grenade launcher.  Weird how they're not able to use either of those weapons without causing problems.  Oh well.  Glad to see that's all it is and that it's an easy fix.  Thanks, guys.
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