Attempt to get length of a nil value [CRASH]

The game crashes when I try to play heists on Mayhem. Here is the full crashlog:

     Application has crashed: C++ exception
     ...WeaponLib/modules/general_fixes/newraycastweaponbase.lua:175: attempt to get length of a nil value
     
     SCRIPT STACK
     
     _update_stats_values() @mods/base/req/core/Hooks.lua:260
     original() @mods/WeaponLib/modules/general_fixes/newraycastweaponbase.lua:11
     done_cb() @mods/base/req/core/Hooks.lua:260
     clbk_part_unit_loaded() lib/managers/weaponfactorymanager.lua:852
     assemble_from_blueprint() lib/managers/weaponfactorymanager.lua:631
     assemble_from_blueprint() @mods/WeaponLib/modules/different_akimbos/newraycastweaponbase.lua:20
     liwl_original_playerinventory_addunitbyfactoryname() lib/units/beings/player/playerinventory.lua:218
     add_unit_by_factory_name() @mods/Less Inaccurate Weapon Laser/playerinventory.lua:7
     _internal_load() lib/managers/playermanager.lua:683
     spawned_player_original() lib/managers/playermanager.lua:956
     spawned_player() @mods/WolfHUD/lua/GameInfoManager.lua:2830
     set_unit() lib/network/base/networkpeer.lua:2302
     spawn_unit_original() lib/network/base/networkpeer.lua:2168
     spawn_unit() @mods/Bot Weapons/lua/networkpeer.lua:3
     spawn_players() lib/network/base/basenetworksession.lua:1513
     update_original() lib/states/ingamewaitingforplayers.lua:277
     update() @mods/WolfHUD/lua/MenuTweaks.lua:609
     update() core/lib/utils/game_state_machine/coregamestatemachine.lua:92
     update() lib/setups/setup.lua:876
     update() lib/setups/gamesetup.lua:711
     update() lib/setups/networkgamesetup.lua:21
     core/lib/setups/coresetup.lua:540
     
     
     -------------------------------
     
     Callstack:
     
              payday2_win32_release  (???)     ???                                                 
              payday2_win32_release  (???)     zip_get_name                                        
              payday2_win32_release  (???)     zip_get_name                                        
     
     
     -------------------------------
     
     Current thread: Main
     
     -------------------------------
     
     System information:
         Application version : 1.92.790
     	 CPU : Intel(R) Core(TM) i7-7700HQ CPU @ 2.80GHz (2 cores); SSE; SSE2; SSE3; SSSE3; SSE4.1; SSE4.2
         DirectX : 12.0 
     	 GPU : NVIDIA GeForce GTX 1070 / nvldumd.dll[26.21.14.3160]
         Language : english
     	 Memory :     16269MB 264KB
         OS : 6.1.7600 () 0x300-0x1 (64 bits)
         Physics : threaded
     	 Renderer : DX9 threaded
         Sound : Realtek Semiconductor Corp. (Speakers (Realtek High Definition Audio))