Trying to edit a scenario where the player has a raven. It saves fine from the editor, but when loading the scenario it crashes with this error:

Error while running event Raven::on_tick (ID 0)
Raven/control.lua:13: attempt to compare number with nil

Edit: After some tinkering around, I managed to avoid the crash on load by putting the Raven inside a chest so it's not an active entity in the world. The player will just have to deploy it themselves.

The editor does not add a structure to the script database. I do not even know why this error occurred, the raven installed in the editor simply will not be able to take off.