natura-1.12.2-4.3.2.42
Mantle-1.12-1.3.2.24
Minecraft 1.12.2 Forge 2705

• Botania+r1.10-355
• biomesoplenty 7.0.1.2393
• waystones 4.0.49

Report Information

No need to take immediate (V 2.42 (recent build = 2.62)) action, just a crash report of a quite uneasy to reproduce bug. I was exploring the mod Botania, then visit the nether in order to raise a few xp. While hunting Pigsmens, I've sucessfully hit a nitro creeper with a punchII / off a clift, then the crash happen...
Note also that the broken by explosion's block is listed as one of BOP.

Instead of just taking fall damage, then die from my powerIV arrow, or be let alive with 1 HP, The nitro creeper exploded... I've heard from afar the explosion sound effect, like if I was close... but I was at more than 20 blocks away...

Steps to Reproduce

Need Natura build v.42, mess around using botania, visit the nether, then the 4th creeper you kill may explode upon death and crash the game.

Crash Log

https://paste.dimdev.org/zitamavoda.mccrash

Forge Log

crash-2018-09-02_14.08.56-server.txt
latest.log

Note about latest.log... (My last actions before crash)
[14:01:36] [main/INFO] [net.minecraft.client.gui.GuiNewChat]: [CHAT] Activated Waystone: Nether
[14:08:56] [Server thread/ERROR] [net.minecraft.server.MinecraftServer]: Encountered an unexpected exception
net.minecraft.util.ReportedException: Ticking entity

Note also that while using mod vanilla fix, it look like if there is more than one report in this crash. I did not create that report to create trouble, just to know if this could be linked to an unsolved yet problem, or else. Good luck, you could close it. I would only update this post if I'm able to reproduce it once my mods are up to date!

Bad News! I've encountered this bug again, with the appropriate version.
Mantle-1.12-1.3.3.39
natura-1.12.2-4.3.2.62
BiomesOPlenty-1.12.2-7.0.1.2402-universal
vanillafix 1.0.9-97
Forge 2768
Memory: 179089720 bytes (170 MB) / 1597440000 bytes (1523 MB) up to 3941859328 bytes (3759 MB)
https://paste.dimdev.org/iyujumunap.mccrash

How to reproduce

1 Only happen when fighting a lot of mobs at the same time.
2 Vanilla punch 2 effect on a bow without fire aspect
3 Aim at a nitro creeper, out of detection, or melee range (= 6-12 blocks away)
4 Release a weak shot, a arrow at low speed. The goal is to hit as much mobs as fast as possible, so try to aim at an another mob as soon as possible, or to lower their health so you could finish one later in a single sword blow.
5 Nitro creeper is falling from a cliff.
5a) Note. I guess this bug only happen in a rare occurrence of events
5b) Lots of memory is required by the server because of a few actions taking place at the same time. (ex. fighting many mobs at the same time = over 20.)
5b) The entity take damage, but by the time he is hit, it is unable to find the origin or the damage origin. (Who shot at me?)
5c) Rare IA reaction from creeper. If No damage source or If about to fall from a clift, then start to ignite, in order to release a fast explosion.
5d) Since ignition of a nitro creeper is faster than the average, it make him explode in mid-air
5e) Break some blocks from biomeoplenty.
Broken block in action was some biomeoplenty:overgrown_netherrack
5f) Create a ... event who trigger a game crash.

IllegalArgumentException Cannot get property class GrassType does not exist in minecraft:air
updateEntityWithOptionalForce
updateTimeLightAndEntities
Thread.run(Unknown Source)
GL info: ERROR RuntimeException:

Probably just a minor bug, keep the good work and I will link this with BOP!