Just posting the crash dump from a random client crash that occurred during a large battle on my private server last night.

I have no idea if this information is helpful or not; But the battle was between 4 human players that I'd given godmode via player allowDamage false; in the debug console and about 50 to 100 or so AI, both infantry and armoured and unarmoured vehicles.

Here's the modpack if it helps:

(Note that the last two mods are not on the server. And 3den Enhanced should only be on my client, not the other players'.)