# (stable up to 2513) Building design crashes engine

**URL:** <https://discourse.stonehearth.net/t/stable-up-to-2513-building-design-crashes-engine/15101>\
**Category:** Previous Build Reports\
**Created:** [July 30, 2015, 6:34pm UTC](https://discourse.stonehearth.net/t/stable-up-to-2513-building-design-crashes-engine/15101 "2015-07-30T18:34:08Z")\
**Posts on this page:** 2\
**Page:** 1

<div class="post-metadata">

**Author:** ![Falkkon](https://avatars.discourse-cdn.com/v4/letter/f/71e660/32.png) [@Falkkon](https://discourse.stonehearth.net/u/Falkkon)\
**Post date:** [July 30, 2015, 6:34pm UTC](https://discourse.stonehearth.net/t/stable-up-to-2513-building-design-crashes-engine/15101/1 "2015-07-30T18:34:08Z")

</div>

Designing a building floor with only one space between adjoining walls will cause an error in the engine.

To replicate: Design a floor of any type with a gap of one space wide at any point on the foundation. When walls are added, the engine crashes.

```
develop-2513 (x64)
stonehearth/services/server/build/build_service.luac:219: assertion failed!
stack traceback:
	[C]: ?
	[C]: in function 'assert'
	stonehearth/services/server/build/build_service.luac:219: in function '_get_blueprint_at_point'
	stonehearth/services/server/build/build_service.luac:222: in function '_fetch_blueprint_at_point'
	stonehearth/services/server/build/build_service.luac:227: in function '_fetch_column_at_point'
	stonehearth/services/server/build/build_service.luac:228: in function '_add_wall_span'
	stonehearth/services/server/build/build_service.luac:196: in function 'visitor_fn'
	stonehearth/lib/build_util.luac:251: in function 'grow_walls_around'
	stonehearth/services/server/build/build_service.luac:196: in function 'grow_walls'
	stonehearth/services/server/build/build_service.luac:185: in function 'cb'
	stonehearth/services/server/build/build_service.luac:295: in function 'do_command'
	stonehearth/services/server/build/build_service.luac:185: in function <stonehearth/services/server/build/build_service.luac:185>

develop-2513 (x64)
c++ exception: lua runtime error
stack traceback:

```

Removing the building from edit mode yields:

```
develop-2513 (x64)
...hearth/services/server/build/build_undo_manager.luac:101: assertion failed!
stack traceback:
	[C]: ?
	[C]: in function 'assert'
	...hearth/services/server/build/build_undo_manager.luac:101: in function 'clear'
	stonehearth/services/server/build/build_service.luac:44: in function 'set_teardown'
	stonehearth/call_handlers/build_call_handler.luac:7: in function <stonehearth/call_handlers/build_call_handler.luac:6>

develop-2513 (x64)
c++ exception: lua runtime error
stack traceback:

```

As this error was also present in the original Steam release build, I assume someone else may have posted this.

Error is still present in 2521, yielding:

```
develop-2521 (x64)
stonehearth/services/server/build/build_service.luac:219: assertion failed!
stack traceback:
	[C]: ?
	[C]: in function 'assert'
	stonehearth/services/server/build/build_service.luac:219: in function '_get_blueprint_at_point'
	stonehearth/services/server/build/build_service.luac:222: in function '_fetch_blueprint_at_point'
	stonehearth/services/server/build/build_service.luac:227: in function '_fetch_column_at_point'
	stonehearth/services/server/build/build_service.luac:228: in function '_add_wall_span'
	stonehearth/services/server/build/build_service.luac:196: in function 'visitor_fn'
	stonehearth/lib/build_util.luac:251: in function 'grow_walls_around'
	stonehearth/services/server/build/build_service.luac:196: in function 'grow_walls'
	stonehearth/services/server/build/build_service.luac:186: in function 'cb'
	stonehearth/services/server/build/build_service.luac:295: in function 'do_command'
	stonehearth/services/server/build/build_service.luac:186: in function <stonehearth/services/server/build/build_service.luac:185>
```

---

<div class="post-metadata">

**Author:** ![Falkkon](https://avatars.discourse-cdn.com/v4/letter/f/71e660/32.png) [@Falkkon](https://discourse.stonehearth.net/u/Falkkon)\
**Post date:** [August 6, 2015, 9:58pm UTC](https://discourse.stonehearth.net/t/stable-up-to-2513-building-design-crashes-engine/15101/2 "2015-08-06T21:58:50Z")

</div>

Still present in 2534 (complex building fix):

```
develop-2534 (x64)
stonehearth/services/server/build/build_service.luac:219: assertion failed!
stack traceback:
	[C]: ?
	[C]: in function 'assert'
	stonehearth/services/server/build/build_service.luac:219: in function '_get_blueprint_at_point'
	stonehearth/services/server/build/build_service.luac:222: in function '_fetch_blueprint_at_point'
	stonehearth/services/server/build/build_service.luac:227: in function '_fetch_column_at_point'
	stonehearth/services/server/build/build_service.luac:228: in function '_add_wall_span'
	stonehearth/services/server/build/build_service.luac:196: in function 'visitor_fn'
	stonehearth/lib/build_util.luac:251: in function 'grow_walls_around'
	stonehearth/services/server/build/build_service.luac:196: in function 'grow_walls'
	stonehearth/services/server/build/build_service.luac:186: in function 'cb'
	stonehearth/services/server/build/build_service.luac:295: in function 'do_command'
	stonehearth/services/server/build/build_service.luac:186: in function <stonehearth/services/server/build/build_service.luac:185>

```

Building design stays if you try to remove.