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Poly Build tool crashes blender when deleting vertices
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Description

System Information
Operating system: Windows-10-10.0.14393 64 Bits
Graphics card: GeForce GTX 1050 Ti/PCIe/SSE2 NVIDIA Corporation 4.5.0 NVIDIA 431.86

Blender Version
Broken: version: 2.81 (sub 15), branch: master, commit date: 2019-10-22 15:34, hash: rBac18c3c28dee
Worked: (optional)

Short description of error
Blender crashes when poly build tool is used to delete vertices using shift left mouse
To be more precise, it happens when the segment of vertices goes from 3 to 2 ( as images show below)

Exact steps for others to reproduce the error
-Default document
-Colapse the cube into a single vertex
-extrude that point two times so you have a L shaped line with three points
-Use Poly build tool (shift+space > shift+3) to delete middle point using Shift + Left mouse click
-Crash