Hi,
This bug appeared quite some time ago for me so i'm not sure exactly what caused it. Most likely suspect is me adding lots of mods during playthrough. Other idea is a pack of 180ish manhunter boomalopes that exploded all at once, possibly reaching a limit of some variable?
This is from error log:
System.NullReferenceException: Object reference not set to an instance of an object
at Verse.Explosion.Tick () [0x00000] in <filename unknown>:0
at Verse.ExplosionManager.MapComponentTick () [0x00000] in <filename unknown>:0
at Verse.Map.MapPostTick () [0x00000] in <filename unknown>:0
Verse.Log:Error(String)
Verse.Map:MapPostTick()
Verse.TickManager:DoSingleTick()
Verse.Game:<LoadGame>m__72A()
Verse.LongEventHandler:ExecuteToExecuteWhenFinished()
Verse.LongEventHandler:UpdateCurrentAsynchronousEvent()
Verse.LongEventHandler:LongEventsUpdate(Boolean&)
Verse.Root:Update()
Verse.Root_Play:Update()
Its the only thing in the log that has anything to do with damage/fire/explosions.
Which is the actual problem, most of mortars or other fire/explosion infilciting weapons, like APB Projector from GlitterTech simply do not work.
I tested the same mod loadout & order on freshly created colony, everything works there.
After quick googling number of similiar problems surface, apparently it's not just mods that are causing it:
https://ludeon.com/forums/index.php?topic=25352.0 (https://ludeon.com/forums/index.php?topic=25352.0)
https://github.com/skyarkhangel/Hardcore-SK/issues/614 (https://github.com/skyarkhangel/Hardcore-SK/issues/614)
https://github.com/skyarkhangel/Hardcore-SK/issues/646 (https://github.com/skyarkhangel/Hardcore-SK/issues/646)
https://www.reddit.com/r/RimWorld/comments/5sa51f/zzzzt_explosion_seems_to_have_broken_my_game/ (https://www.reddit.com/r/RimWorld/comments/5sa51f/zzzzt_explosion_seems_to_have_broken_my_game/)
This bug, which I didnt post eariler also causes my fps to drop big time.