Error while running event LTN_Combinator_Modernized::on_gui_confirmed (ID 162)
The filter conflicts with the filter in the slot 15.
stack traceback:
[C]: in function 'set_slot'
LTN_Combinator_Modernized/script/ltn_combinator.lua:454: in function 'set_misc_signal'
LTN_Combinator_Modernized/script/ltn_combinator.lua:747: in function 'handler'
LTN_Combinator_Modernized/script/ltn_combinator.lua:982: in function 'wrapper'
flib/gui.lua:147: in function 'handler'
flib/gui.lua:177: in function 'handler'
core/lualib/event_handler.lua:47: in function <core/lualib/event_handler.lua:45>

Can you provide some more information? What were you doing specifically? For something like this the actual reproduction state may be necessary. If you can provide a save game that will reproduce this, and instructions to follow once loaded I'll be able to determine what's going on.

Not sure exactly. I was just setting up some train stops.
I think it is a rare bug, because only happened once and haven't being able to reproduce it.
I'll let you know if it happens again and will attach a save file.
Thanks

By any chance did it have anything to do with using a blueprint from 1.1?

I did use some old blueprints for my depots.
But I can now remember, the bug came up as I was quickly placing some Ltn Combinators (blueprints didn't include any). Then I reloaded, redid the same operation in a slower pace and no problemo.

This should be protected against now. I'd be curious if you still run into it.

I'll be testing this for sure. Thanks!