I've been encountering some bugs, and I'll report them here whenever I get new ones

Error while running event
Fixed_Tiberium::on_entity_died (ID 4)
Fixed_Tiberium/control.lua:154:
attempt to index field '?' (a nil value)
Happened when destroying (with piercing ammo) an underground pipe that I just placed. It did not contain any tiberium.

Edit: Filling the pipe with tiberium allowed me to destroy it. I can provide a savegame where the bug is reproducible.

Error while running event
Fixed_Tiberium::on_tick (ID 0)
Error while running event
Fixed_Tiberium::on_entity_died (ID 4)
Fixed_Tiberium/control.lua:154:
attempt to index field '?' (a nil value)
stack traceback:
Fixed_Tiberium/control.lua:267: in function
<Fixed_Tiberium/control.lua:173>

same place, right after a water-filled pipe was destroyed by tiberium