After updating to 1.2.5 I can no longer load my game:

The mod Project Cybersyn (1.2.5) caused a non-recoverable error.
Please report this error to the mod author.

Error while running event cybersyn::on_configuration_changed
LuaEntity API call when LuaEntity was invalid.
stack traceback:
    [C]: in function '__index'
    __cybersyn__/scripts/factorio-api.lua:324: in function 'get_comb_control'
    __cybersyn__/scripts/migrations.lua:164: in function 'func'
    __flib__/migration.lua:63: in function 'run'
    __flib__/migration.lua:90: in function 'on_config_changed'
    __cybersyn__/scripts/migrations.lua:267: in function <__cybersyn__/scripts/migrations.lua:264>

Save file: https://cdn.modo.lv/temp/cyberbug.zip

hmm, that should only happen if somehow a combinator was broken without raising any on_broken events. Would you have any idea how that might have happened?

Not really. I'm not doing anything special with them, just straightforward depots, fuel stations and providers/requesters. I do use Blueprint Sandboxes to work out blueprints, but it has never been a problem before and I don't think I have any stations placed at the time of the save.

I'll put in a temporary fix in the next version but this is definitely a symptom of a larger issue.

could you create a world download for me to analyze?

Since I don't know the exact cause I can't create specific world, does the save file not work?

oh I missed it in your original message

This was permanently fixed in 1.2.9. However I noticed a different mod is causing a crash in your world for me now. I looked into it but there is nothing I can do to fix it.

Probably Gizmo's Car Keys, it was causing a lot of problems recently. Seems to have been fixed in the latest updates though.