my server crashed, is this a bug or something?

[Rickzzs]

[string "scripts/stategraphs/SGwarg.lua"]:171: attempt to compare number with boolean
LUA ERROR stack traceback:
scripts/stategraphs/SGwarg.lua:171 in () ? (Lua) <170-176>
   inst = 148814 - warg (valid:true)
=(tail call):-1 in ()  (tail) <-1--1>
scripts/stategraph.lua:406 in (method) HandleEvents (Lua) <400-420>
   self =
      tags = table: 0000000038864600
      mem = table: 0000000045E3C610
      statemem = table: 0000000038864560
      currentstate = table: 0000000035958800
      timeinstate = 0.33333335071802
      sg = Stategraph : warg
      inst = 148814 - warg (valid:true)
      statestarttime = 5014.5002615266
      bufferedevents = table: 0000000034ECDDA0
      laststate = table: 0000000045E37480
      lastupdatetime = 5014.8335948773
   buff_events = table: 0000000034ECDDA0
   k = 1
   event = table: 000000001C895CF0
scripts/stategraph.lua:154 in (method) UpdateEvents (Lua) <148-157>
   self =
      updaters = table: 000000001C89BE20
      OnEnterNewState = function - scripts/stategraph.lua:27
      tickwaiters = table: 0000000015A1E1A0
      haveEvents = table: 000000001C89CEB0
      hibernaters = table: 0000000015A1E8D0
      instances = table: 0000000015A1DF20
   evs = table: 0000000034ECCE00
   k = sg="warg", state="howl", time=1.73, tags = "busy,howling,"
   v = true
scripts/stategraph.lua:145 in (method) Update (Lua) <109-146>
   self =
      updaters = table: 000000001C89BE20
      OnEnterNewState = function - scripts/stategraph.lua:27
      tickwaiters = table: 0000000015A1E1A0
      haveEvents = table: 000000001C89CEB0
      hibernaters = table: 0000000015A1E8D0
      instances = table: 0000000015A1DF20
   current_tick = 150487
   waiters = table: 000000003540A400
   updaters = table: 0000000034ECCAE0
scripts/update.lua:282 in () ? (Lua) <218-292>
   dt = 0.033333335071802
   tick = 150487
   i = 150487