A crash when the player leaves the blue crabking

[string "scripts/prefabs/crabking.lua"]:402: attempt to index field 'freezable' (a nil value)
LUA ERROR stack traceback:
scripts/prefabs/crabking.lua:402 in (field) endcastspell (Lua) <383-420>
   inst = 104966 - crabking (valid:true)
   lastwasfreeze = nil
   range = 3.75
   x = -50.676998138428
   y = -0.0049999998882413
   z = 161.88800048828
   ents = table: 2BA95470
   i = 1
   ent = 134453 - crabking_feeze (valid:true)
scripts/stategraphs/SGcrabking.lua:387 in (field) fn (Lua) <386-388>
scripts/scheduler.lua:177 in (method) OnTick (Lua) <155-207>
   self =
      running = table: 3FA24490
      waitingfortick = table: 3FA24670
      tasks = table: 3FA24260
      waking = table: 2BA93D78
      attime = table: 3FA24210
      hibernating = table: 3FA24698
   tick = 4870
   k = PERIODIC 104966: 0.000000
   v = true
   already_dead = false
scripts/scheduler.lua:371 in (global) RunScheduler (Lua) <369-377>
   tick = 4870
scripts/update.lua:180 in () ? (Lua) <159-238>
   dt = 0.033333335071802
   tick = 4870
   i = 4870

[00:40:22]: [string "scripts/prefabs/crabking.lua"]:402: attempt to index field 'freezable' (a nil value)
LUA ERROR stack traceback:
    scripts/prefabs/crabking.lua:402 in (field) endcastspell (Lua) <383-420>
    scripts/stategraphs/SGcrabking.lua:387 in (field) fn (Lua) <386-388>
    scripts/scheduler.lua:177 in (method) OnTick (Lua) <155-207>
    scripts/scheduler.lua:371 in (global) RunScheduler (Lua) <369-377>
    scripts/update.lua:180 in () ? (Lua) <159-238>