Did you pick up an item, is there an item in the area? an entity seems to be being pulled in by the botania magnet and it's checking if it's blacklisted.... i believe it is.... can you name it?
Hrmm. Seems to have been caused by a Tinker's construct Pick - that's the only item that was in the vicinity of your logout area.
Not just that, it's a ticking entity, so i'm going to guess it has moss on it, any ideas to the specific kind?
Ahhh...mod bug - and fixed in a slightly later version of Botania - R1.8 241 Fixed a crash when some odd items are dropped around a Ring of Magnetization. Fixed the Config Adaptor trying to modify correct values and spamming you about it in the chat. [API] Implemented a recursion limiter to the magnet ring's blacklist functions for pesky items that intercept getItemDamage(). [API] Increased version number to 71. BeeHappy is on R1.8 238 XD