Hi there, I was getting this error when I scanned a new planet in Space Exploration and moving the camera around:

Error while running event glowing_trees::on_nth_tick(10)
There is no valid object with id 867104.
stack traceback:
[C]: in function 'set_time_to_live'
glowing_trees/control.lua:541: in function <glowing_trees/control.lua:469>

Otherwise this is a fantastic mod. I use it since version 0.0.1 and absolutely love it. :-)

Thanks for the report, I'm looking into this and intend to push an update to fix it as soon as I can.
And I'm so glad you're enjoying the mod, it's always great to get nice feedback :)