Crash on unpausing

[TheElderMindseeker]

Background: Asus K55V, Intel Core i3 (x86-64), Kali Linux, Built from source version 0.11a
World generated successfully, game starting successfully. When assigning tasks like Harvesting and Mining in Pause mode works Ok. When running game by Steps (using "/" button) works Ok, but when unpausing using "spacebar" throws an exception with what(): Visibility present, but no AI? (of type std::runtime_error)

[thebracket]

Thanks for playing! I'll be getting into this in the UI/graphics revamp shortly, so I'll hold the issue until then and make sure it comes out of the washer clean.