Failed to load mods: research-automation-combinator/prototypes/signal.lua:243: bad argument #1 of 2 to 'ipairs' (table expected, got nil)
stack traceback:
[C]: in function 'ipairs'
research-automation-combinator/prototypes/signal.lua:243: in function 'create_tech_signal'
research-automation-combinator/prototypes/signal.lua:287: in function 'create_initial_signals'
research-automation-combinator/data-updates.lua:3: in main chunk

Mods to be disabled:
• research-automation-combinator (1.0.1)

I believe this should be fixed in 1.0.2 - but if you still see it then please provide a list of other mods you have so I can reproduce this.