**System Information**
Operating system and graphics card
**Blender Version**
Broken:2.74 hash:000dfc0
**Short description of error**
When using 'Skin Resize' (ctrl-a) in edit mode on these edges (with the skin modifier applied), I get a 100% repeatable crash when it reaches 0. This is true for scaling with incremental snapping (the only way I could get to 0 manually), but I found out about it by typing in an exact size (0.3, so it first scales to zero).
Things I tried to fix this:
Changing the root vertex - did not change anything, it still crashed.
'Remove Doubles' - no doubles removed, still crashed
'Smooth' - Smoothed untill it was entirely smooth and untangled, still crashed.
'Select All', 'Checker Deselect', 'Dissolve Vertices'. - this fixed the problem, but I don't have the time to test vertex by vertex which one's the culprit.
**Exact steps for others to reproduce the error**
Select one of the meshes
Go into edit mode
'Select All' (a)
'Skin Resize' (ctrl-a)
Type in zero. This will crash to desktop immediately, without warning.
This is a pretty messy mesh, and undoubtable an edge case as far as what people use the Skin Modifier for, but it's 100% repeatable, and I've attached the .blend.{F168676} to hopefully narrow down what's happening.