I ran into this error, and it told me to tell the author's mod, so here it is:

Error while running event playtime-plus::on_nth_tick(216000)
playtime-plus/control.lua:47: attempt to index field '?' (a nil value)
stack traceback:
playtime-plus/control.lua:47: in function 'save_gui_location'
playtime-plus/control.lua:100: in function 'set_gui_location'
playtime-plus/control.lua:83: in function 'snap_gui'
playtime-plus/control.lua:113: in function <playtime-plus/control.lua:111>

Thanks for the report.

Can you provide a savedata or situation information that leads to reproduce the bug?

I think, I install this mod in something like 47:45 of play time, and this appeared before autosave at 48:00 ( It's in hours). In this save, I play with Space exploration mod, and some QOL mods. I don't remember doing anything to cause this.

Sorry for such short report, but I don't remember more.

Thanks for the valuable information.
I believe the bug is fixed now even though I couldn't reproduce it.

If the bug is still happening, let me know :)

Details:
The bug is occured if there is a non-player LuaPlayer created by other mods or some reasons.
In such case, a timer gui is failed to reposition at 1 hour (216000 ticks) due to missing initialization for global vars.

Around ten minutes ago from me writing this, I have suffered a fatal error that is exactly what Etien has listed. For me it crashes at the 34th Hour to be exact, I don't believe any mods I have are interfering with the mod, but these are the mods I am using:

AAI Containers & Warehouses
Textplates

Update: I went and applied the most recent update for the mod, and now the time is stuck at the date of around a few minutes before the 34th Hour, and does not move. I will be disabling the mod in caution to prevent another crash, but will enable it again when the issue is resolved.

Sorry for bothering you.

Let me confirm the problem.
Your timer is now frozen (no update and immovable) instead of a crash after updated to the latest.

I can guess the reason but not sure how to reproduce it.
It must be releated to LuaPlayer objects.

Do you play multiplayer? Or did you change your player name recently?

Finally the bug is gone.
The mod is updated to 1.0.5

Finally the bug is gone.
The mod is updated to 1.0.5

Nice