Got a non-recoverable error when I clicked the mod-icon. Full error message:

Error while running event MaintenanceMadness::on_gui_click (ID 1)
Unknown style technology_description_slot
stack traceback:
MaintenanceMadness/control-gui.lua:224: in function 'populateItemPolicyTable'
MaintenanceMadness/control-gui.lua:959: in function 'toggleMasterPanel'
MaintenanceMadness/control-gui.lua:1398: in function 'processClickedElement'
MaintenanceMadness/control.lua:2054: in function <MaintenanceMadness/control.lua:2053>
stack traceback:
[C]: in function 'add'
MaintenanceMadness/control-gui.lua:224: in function 'populateItemPolicyTable'
MaintenanceMadness/control-gui.lua:959: in function 'toggleMasterPanel'
MaintenanceMadness/control-gui.lua:1398: in function 'processClickedElement'
MaintenanceMadness/control.lua:2054: in function <MaintenanceMadness/control.lua:2053>

I guess the mod-list is probably not important, but I'll post it anyway.
- Bottleneck
- Maintenance Madness
- Space Extension Mod
- VortiK's Deep core mining
- Warehousing Mod
- Whistle Stop Factories

I just got the exact same error, the only mods I have in common are bottleneck and Maintenance Madness itself I do not think bottleneck would cause this type of error though

Same here

Okay, made fix for that. https://mods.factorio.com/mod/SP-mm-fixer

Thank you SuicideParty. Let's hope that dev will dev once again some time =(

Hi SP, thank you for troubleshooting this problem - this helped me tracking down the cause of this error.
It's now fixed. Thank you all for your patience :)