The mod Planet Erimos Prime (0.0.8) caused a non-recoverable error.
Please report this error to the mod author.

Error while running event planet_erimos_prime::on_player_changed_surface (ID 57)
LuaEntity API call when LuaEntity was invalid.
stack traceback:
[C]: in function 'index'
__mferrari_lib/surface.lua:427: in function 'ClearArea'
planet_erimos_prime/control_levels.lua:32: in function 'Create_Initial_Level'
planet_erimos_prime/control.lua:131: in function <planet_erimos_prime/control.lua:123>

What are the chances it was caused by me dropping some items onto the planets surface beforehand?

Like it might have preloaded which then caused the problems when I finally loaded it.

Will test, I have a save like 2 minutes before I dropped the stuff.

please try updating the lib mod...

At the time, I updated all mods.

The only difference between earlier was me switching to experimental

But now It seems to have updated so I will try again