Failed to load mods: research-automation-combinator/prototypes/signal.lua:178: attempt to compare number with nil
stack traceback:
research-automation-combinator/prototypes/signal.lua:178: in function 'tech_tier'
research-automation-combinator/prototypes/signal.lua:255: in function 'create_tech_signal'
research-automation-combinator/prototypes/signal.lua:307: in function 'create_initial_signals'
research-automation-combinator/data-updates.lua:3: in main chunk

Let me know if you need more information, but seems like just to check for nil values

Would be nice to know what mod is causing and why - but it's a trivial thing to add the check, so I've done that.

If you get another error after updating to 1.0.5, let me know - might be a mod doing something weird and unexpected and I'll have to test it more fully.

Thank you for your quick response,
it will be some challenge to find the mod causing it, at the moment i have ~150 mods enabled.