Crash report: https://i.imgur.com/FsFJNga.png
This happened while I was trying to turn around a belt-inserter using the 'R' key.

Thanks for reporting the issue.
Please provide a list of all other mods you have installed and exact steps how to reproduce the problem.

Is there a way to create a mod list? manually listing everything would be a pain in the ass because I'm using a LOT of them.

Steps to reproduce issue:
1. Place 2 miniloaders together (load/unload),
2. Place a chest next to one of them
3. Then change the belt direction of the miniloaders.
The crash doesn't happen all the time, seems to be limited to things placed within a few seconds ago.

I have the same issue! Here is the logs:

3600.120 Info AppManager.cpp:306: Saving to _autosave3 (blocking).
13601.800 Info AppManagerStates.cpp:1941: Saving finished
14223.671 Error MainLoop.cpp:1284: Exception at tick 17101314: The mod Inserter Configuration (1.0.0) caused a non-recoverable error.
Please report this error to the mod author.
Error while running event Inserter_Config::inserter-config-drop-distance-adjust (ID 202)
real number expected got nan.
stack traceback:
[C]: in function 'newindex'
__Inserter_Config/control.lua:128: in function 'set_arm_positions'
Inserter_Config/control.lua:504: in function <Inserter_Config/control.lua:470>
14223.671 Error ServerMultiplayerManager.cpp:91: MultiplayerManager failed: "The mod Inserter Configuration (1.0.0) caused a non-recoverable error.
Please report this error to the mod author.
Error while running event Inserter_Config::inserter-config-drop-distance-adjust (ID 202)
real number expected got nan.
stack traceback:
[C]: in function 'newindex'
__Inserter_Config/control.lua:128: in function 'set_arm_positions'
Inserter_Config/control.lua:504: in function <Inserter_Config/control.lua:470>"
14223.671 Info ServerMultiplayerManager.cpp:797: updateTick(17101314) changing state from(InGame) to(Failed)
14223.687 Quitting: multiplayer error.
14224.414 Info ServerMultiplayerManager.cpp:140: Quitting multiplayer connection.
14224.414 Info ServerMultiplayerManager.cpp:797: updateTick(4294967295) changing state from(Failed) to(Closed)
14224.415 Info UDPSocket.cpp:218: Closing socket
14224.415 Info UDPSocket.cpp:248: Socket closed
14224.415 Info UDPSocket.cpp:218: Closing socket
14224.567 Info UDPSocket.cpp:218: Closing socket
14224.567 Info UDPSocket.cpp:248: Socket closed
14224.567 Goodbye

{
"mods":
[

{
  "name": "base",
  "enabled": true
},

{
  "name": "aai-industry",
  "enabled": true
},

{
  "name": "aai-signal-transmission",
  "enabled": true
},

{
  "name": "Aircraft",
  "enabled": true
},

{
  "name": "alien-biomes",
  "enabled": true
},

{
  "name": "BigBags",
  "enabled": true
},

{
  "name": "Bottleneck",
  "enabled": true
},

{
  "name": "clock",
  "enabled": true
},

{
  "name": "Companion_Drones",
  "enabled": true
},

{
  "name": "even-distribution",
  "enabled": true
},

{
  "name": "Factorissimo2",
  "enabled": true
},

{
  "name": "factoryplanner",
  "enabled": true
},

{
  "name": "flib",
  "enabled": true
},

{
  "name": "informatron",
  "enabled": true
},

{
  "name": "Inserter_Config",
  "enabled": true
},

{
  "name": "jetpack",
  "enabled": true
},

{
  "name": "LogisticTrainNetwork",
  "enabled": true
},

{
  "name": "LtnManager",
  "enabled": true
},

{
  "name": "miniloader",
  "enabled": true
},

{
  "name": "robot_attrition",
  "enabled": true
},

{
  "name": "shield-projector",
  "enabled": true
},

{
  "name": "space-exploration",
  "enabled": true
},

{
  "name": "space-exploration-graphics",
  "enabled": true
},

{
  "name": "space-exploration-graphics-2",
  "enabled": true
},

{
  "name": "space-exploration-graphics-3",
  "enabled": true
},

{
  "name": "space-exploration-graphics-4",
  "enabled": true
},

{
  "name": "space-exploration-graphics-5",
  "enabled": true
},

{
  "name": "space-exploration-postprocess",
  "enabled": true
},

{
  "name": "Todo-List",
  "enabled": true
},

{
  "name": "Transport_Drones",
  "enabled": true
}

]
}

i suspect its an issue with miniloaders, iirc those are implemented as invisible inserters, maybe that causes problems

if the crash doesn't happen all the time, its kinda hard to figure out why its happening
im looking into it when i find time for it, im not modding or playing factorio atm, so no ETA on a fix