Steps to reproduce:

1. Download and import attached project.
2. Open scene: 02_effects_preview
3. Press play.
4. Make sure scene view and console are visible.
5. In Project window Find prefab: lightning_gun_beam
6. Drag that prefab into scene view, but don't release, then drag it to console window.

Expected result: Nothing happens.
Actual result: Error appears:
MissingReferenceException: The object of type 'LineRenderer' has been destroyed but you are still trying to access it.
Your script should either check if it is null or you should not destroy the object.

Note: Errors appear even when you finish doing everything and the only way to stop them is to restart Unity.

Reproduced on: 5.5.0a3, 5.4.0b23, 5.3.5f1