Crash on Ctrl+RMB on machine module

[iassasin]

Problem Description

I just tried to clear modules of machine (space thermal radiator, mouse cursor on that module at screenshot) with mouse shortcut (Ctrl+RMB), but something went wrong:

Error while running event factoryplanner::on_gui_click (ID 1)
__factoryplanner__/ui/main/production_handler.lua:183: attempt to index local 'module_set' (a nil value)
stack traceback:
    __factoryplanner__/ui/main/production_handler.lua:183: in function 'handler'
    __factoryplanner__/ui/event_handler.lua:157: in function <__factoryplanner__/ui/event_handler.lua:114>

Reproduction

I can't reproduce it. My case was something like this:

1. Change tier of radiator from 1 to 2
2. Revert to tier 1
3. Copy beacon from other machine in this subfactory and paste over radiator
4. Add 2 speed modules to radiator
5. Remove beacon from radiator by Ctrl+RMB
6. Again paste beacon from clipboard over radiator
7. Remove modules from radiator by Ctrl+RMB (crash here)

But when I load autosave, this scenario doesn't crash game anymore. Probably I miss some very important little step :(

[iassasin]

I dug up something interesting. Bugs, but not crash. But maybe related to crash somehow.

Map for tests: https://sinair.ru/f/BCxTPg (70 MB) Video of these steps: https://discord.com/channels/600791114814980141/600791114831757416/1261028290760540210

Machine with broken modules slot:

1. Set any 2 modules in radiator
2. Ctrl+RMB on machine to reset it
3. Modules gone. Slot for it too.

Paste modules on machine module slot doesn't work:

1. Copy modules to clipboard
2. Open machine module slot gui
3. Does NOT change anything, leave slot empty and close gui (escape)
4. Try paste (Shift+LMB) over machine modules slot
5. Slot stays empty
6. Second try successfully inserting modules