If the settings for the multiplayer options are set as follows:

Number of players : 1
Run Dedicated Server : True (Checked)
Use Single Process: False (Unchecked)
Editor Multiplayer Mode: Play As Client

and the user had a Widget showing on screen, the editor will crash when hitting play

Steps to Reproduce
  1. Down load attached project
  2. Open Project
  3. Click play
  4. Wait for it to finish
  5. Notice the Editor crashes

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ComponentUE - Editor - UI Systems
Affects Versions4.7.14.8
Target Fix4.8
Fix Commit2472372
CreatedMar 4, 2015
ResolvedMar 23, 2015
UpdatedApr 27, 2018