maybe it is because empty fuel category? or maybe because they use fuel categories instead just a fuel category?(you know the fuel processor)

this is what happen when start new game with both on,but if just aai or k2 then it can work.

  24.466 Checksum for script __aai-industry__/control.lua: 1216366203
  24.490 Checksum for script __creative-mod__/control.lua: 2460366014
  24.505 Checksum for script __ingteb__/control.lua: 1948456833
  24.514 Checksum for script __Krastorio2__/control.lua: 3982411304
  24.520 Script @__ingteb__/core/Sonaxaton.lua:5: Info: optional mod 'sonaxaton-research-queue-with-interface' not present.
  24.520 Script @__ingteb__/core/Sonaxaton.lua:7: Info: optional mod 'sonaxaton-research-queue' not present.
  24.593 Script @__ingteb__/ingteb/Database.lua:87: database initialize start...
  24.593 Script @__ingteb__/ingteb/Database.lua:115: database scan recipes ...
  24.596 Script @__ingteb__/ingteb/Database.lua:117: database scan technologies ...
  24.601 Script @__ingteb__/ingteb/Database.lua:119: database scan items ...
  24.601 Script @__ingteb__/ingteb/Database.lua:121: database scan entities ...
  24.611 Script @__ingteb__/ingteb/Database.lua:124: database special things...
  24.611 Script @__ingteb__/ingteb/Database.lua:126: database initialize categories...
  24.620 Script @__ingteb__/ingteb/Database.lua:131: database initialize recipes...
  24.706 Script @__ingteb__/ingteb/Database.lua:134: database initialize complete.
  24.903 Error MainLoop.cpp:1284: Exception at tick 0: The mod Ingame Technology browser (0.3.25) caused a non-recoverable error.
Please report this error to the mod author.

Error while running event ingteb::on_tick (ID 0)
__ingteb__/ingteb/Common.lua:298: attempt to concatenate field 'name' (a nil value)
stack traceback:
    __ingteb__/ingteb/Common.lua:298: in function 'new'
    __ingteb__/ingteb/FuelCategory.lua:34: in function 'new'
    __ingteb__/ingteb/Database.lua:155: in function 'GetProxy'
    __ingteb__/ingteb/Selector.lua:229: in function 'EnsureGroups'
    __ingteb__/ingteb/Selector.lua:314: in function 'EnsureData'
    __ingteb__/ingteb/EventManager.lua:191: in function 'Handler'
    __ingteb__/core/EventManager.lua:55: in function <__ingteb__/core/EventManager.lua:51>

oh,just side note,it is 0.3.25.

Reproducable!