"Lua error: unhandled exception" Exception type: std::out_of_range What: bitset::set

Anyone seen this error before?
in stdout:

Zitat

Lua error: unhandled exception
Exception type: std::out_of_range
What: bitset::set

any hints how to debug. I have no clue where that happens...
even web searching didn't find anything about above phrases..
(duckduckgo weirdley brought only C++ results for search phrase "Lua error: unhandled exception" (with quotes)...)
std::out_of_range and bitset::set sounds like errors in the C++ stack..
after creation of the minidump I got:
/home/urban/build/transport_fever/transport_fever_release/src/Lib/ecs/Engine.h:264: int ecs::Engine::GetComponentDataIndex(const ecs::Entity&, int) const: Assertion `it != components.end()' failed.

hmm..

Edit:
I now worked/debug all ways through the lua/mod stuff... the error occurs past lua/mod processing, which seems to work fine...

My new assumption is, it's kind of too much data at all in lua part (what does exactly go from lua to c++ code??)
my previous assumption was, game would crash if there are too many lanes to build by a complex building (limit somewhere between 400 and 430 lanes)
now I made a script, to limit the lanes.
In several iterations a limit of number of lanes per node is created, I create therefor copies (not references) of tables.
Now the game crashes (with same error) with a lower count of lanes actually to built (but may wore data actually in lua variables/tables).

some update.
My last guess seems also to be wrong.
I now get the crash with less data and less lanes.
the question is, where or for what purpose does the C++ code use bitsets when creating the structure from lua instructions.

Exception type: std::out_of_range
What: bitset::set
from reference for bitset::set
Throws std::out_of_range if pos does not correspond to a valid position within the bitset.

any ideas?