Err, sorry, the title is wrong. It was 0.18.7 that broke it.

Here's the error message:

Failed to load mods: __MushroomCloud__/data-updates.lua:1: __MushroomCloud__/prototypes/explosions.lua:52: attempt to index field 'animation' (a nil value) stack traceback: __MushroomCloud__/prototypes/explosions.lua:52: in main chunk [C]: in function 'require' __MushroomCloud__/data-updates.lua:1: in main chunk stack traceback: [C]: in function 'require' __MushroomCloud__/data-updates.lua:1: in main chunk

0.18.7
I have the same error

141.161 Factorio initialised
141.176 Mods to disable:Failed to load mods: MushroomCloud/data-updates.lua:1: MushroomCloud/prototypes/explosions.lua:52: attempt to index field 'animation' (a nil value)
stack traceback:
MushroomCloud/prototypes/explosions.lua:52: in main chunk
[C]: in function 'require'
MushroomCloud/data-updates.lua:1: in main chunk
stack traceback:
[C]: in function 'require'
MushroomCloud/data-updates.lua:1: in main chunk

Mods to be disabled:
• MushroomCloud

Thank you, Arcitos

Thanks for your hint - This should be fixed now :)