Fed-Frozen Antlion, server crash on attack

We've recently stumbled upon a crash, when attempting to fight an Antlion, just after feeding it stage 5 thermal stones.

We have 1 mod enabled only: https://steamcommunity.com/sharedfiles/filedetails/?id=1840284484

I'm not sure if it's mod issue or game issue.

Here's a server log:

[01:32:52]: [string "scripts/brains/antlionbrain.lua"]:15: attempt to index field 'worldsettingstimer' (a nil value)
LUA ERROR stack traceback:
scripts/brains/antlionbrain.lua:15 in () ? (Lua) <13-18>
   inst = 101540 - antlion (valid:true)
=(tail call):-1 in ()  (tail) <-1--1>
scripts/behaviourtree.lua:200 in (method) Visit (Lua) <199-205>
   self =
      lastresult = READY
      status = READY
      fn = function - scripts/brains/antlionbrain.lua:22
      parent = table: 2DFA8E48
      name = EatRocks
scripts/behaviourtree.lua:666 in (method) Visit (Lua) <656-687>
   self =
      name = Parallel
      status = READY
      parent = table: 2DFA9528
      children = table: 2DFA8830
      lastresult = READY
   done = true
   any_done = false
   idx = 1
   child = table: 2DFA8DF8
scripts/behaviourtree.lua:601 in (method) Visit (Lua) <577-633>
   self =
      lasttime = 5499.7002868317
      name = Priority
      status = READY
      period = 0.5
      children = table: 2DFA8650
      lastresult = READY
   time = 5499.7002868317
   do_eval = true
   oldidx = nil
   old_event = nil
   found = false
   idx = 1
   child = table: 2DFA8E48
   should_test_anyway = nil
scripts/behaviourtree.lua:22 in (method) Update (Lua) <20-27>
   self =
      inst = 101540 - antlion (valid:true)
      root = table: 2DFA9528
scripts/brain.lua:212 in (method) OnUpdate (Lua) <205-214>
   self =
      bt = Priority - READY <READY> ()>0.00
   >Parallel - READY <READY> ()>0.00
   >   >EatRocks - READY <READY> ()>0.00
   >   >ActionNode - READY <READY> ()>0.00
   >StandAndAttack - READY <READY> ()>0.00
   >Parallel - READY <READY> ()>0.00
   >   >EatRocks - READY <READY> ()>0.00
   >   >ActionNode - READY <READY> ()>0.00
   >Sequence - READY <READY> ()>0.00
   >   >ActionNode - READY <READY> ()>0.00
   >   >Wait - READY <READY> ()>0.00
   >   >ActionNode - READY <READY> ()>0.00

      events = table: 26461038
      behaviourqueue = table: 264611F0
      stopped = false
      inst = 101540 - antlion (valid:true)
scripts/brain.lua:135 in (method) Update (Lua) <105-147>
   self =
      hibernaters = table: 0EF76C18
      updaters = table: 0EF763F8
      tickwaiters = table: 0EF763D0
      instances = table: 0EF76380
   current_tick = 164991
   waiters = table: 2D94C9D0
   k = --brain--
sleep time: 0.00
Priority - READY <READY> ()>0.00
   >Parallel - READY <READY> ()>0.00
   >   >EatRocks - READY <READY> ()>0.00
   >   >ActionNode - READY <READY> ()>0.00
   >StandAndAttack - READY <READY> ()>0.00
   >Parallel - READY <READY> ()>0.00
   >   >EatRocks - READY <READY> ()>0.00
   >   >ActionNode - READY <READY> ()>0.00
   >Sequence - READY <READY> ()>0.00
   >   >ActionNode - READY <READY> ()>0.00
   >   >Wait - READY <READY> ()>0.00
   >   >ActionNode - READY <READY> ()>0.00

   v = true
scripts/update.lua:237 in () ? (Lua) <164-243>
   dt = 0.033333335071802
   tick = 164991
   i = 164991

[01:32:52]: [string "scripts/brains/antlionbrain.lua"]:15: attempt to index field 'worldsettingstimer' (a nil value)
LUA ERROR stack traceback:
    scripts/brains/antlionbrain.lua:15 in () ? (Lua) <13-18>
    =(tail call):-1 in ()  (tail) <-1--1>
    scripts/behaviourtree.lua:200 in (method) Visit (Lua) <199-205>
    scripts/behaviourtree.lua:666 in (method) Visit (Lua) <656-687>
    scripts/behaviourtree.lua:601 in (method) Visit (Lua) <577-633>
    scripts/behaviourtree.lua:22 in (method) Update (Lua) <20-27>
    scripts/brain.lua:212 in (method) OnUpdate (Lua) <205-214>
    scripts/brain.lua:135 in (method) Update (Lua) <105-147>
    scripts/update.lua:237 in () ? (Lua) <164-243>