Situation: added Visible Planets and Editor Extensions mods, then attempted to edit an existing saved SA scenario.

On load, the following crash occurred:

The mod Visible Planets in Space (1.2.12) caused a non-recoverable error.
Please report this error to the mod author.

Error while running event visible-planets::on_tick (ID 0)
LuaPlayer API call when LuaPlayer was invalid.
stack traceback:
    [C]: in function '__index'
    __visible-planets__/control_stuff/render_planets.lua:143: in function 'fancy_animations'
    __visible-planets__/control_stuff/render_planets.lua:174: in function <__visible-planets__/control_stuff/render_planets.lua:162>

Game state:
- Base (2.0.28), Elev Rails, Quality, SA

Other mods enabled:
- Editor Extensions
- [dependency] Factorio Library

I cannot reproduce with only Visible Planets in Space enabled.
I cannot reproduce when both mods are loaded in a standard SA save, only in the scenario editor.

Editor Extensions has closed discussion (for understandable reasons) so reporting only here.

I don't know how LuaPlayer is becoming invalid, and I think it might actually be a small issue on Editor Extensions side.

But that being said, it's a very simple fix on my end to prevent the crash. Next version should work perfectly fine, but let me know if something else breaks while using the map editor.