Crash when using Blender 2.8 function Decimate Geometry on Sprytiled surfaces

[vulture-boy]

Working to simplify the geometry of this curved solid..

Lot easier to apply sprytile to simpler tris, so for this relatively complex solid I used the Decimate Geometry function in certain places.

Seems that whenever the Ratio goes below a certain value, Blender crashes, regardless of what tool is open in Edit Mode... maybe its trying to display a material for a region that geometrically fails?
Either way, would rather it just not be displayed than crash of course. :P

Find attached the geometry in question
bendSample.zip