What did you do?
I opened technology tree screen, clicked on few technologies, then pressed backspace (which should be "Select previous technology".

What happened?
Pressing backspace did nothing.

What did you expect to happen instead? It might be obvious to you, but do it anyway!
I expected ...

I am getting this error after update too. It crashes during factorio startup loading everytime.

EDIT: Works fine when I disable bobplates Works fine when I disable bobplates and bobpower

What did you do?
I tried to block biter spawnpoint with walls and furnaces.
What happened?
The scenario crashed:
Error while running event level::on_tick (ID 0)
position not specified.
stack traceback:
__base__/lualib/attacks.lua:155: in function 'spawn_attack_wave'
__base__/lualib/attacks ...