I've reproduced this crash in 4.16, 4.17, 4.18, 4.19, and Main.
The editor crashes if distance field ambient occlusion is enabled and a viewport is resized to have zero height.
The issue stems from FTileIntersectionResources::InitDynamicRHI() in DistanceFieldObjectCulling.cpp. When TileDimensions.X * TileDimensions.Y evaluates to zero, it attempts to allocate zero size buffer and crashes.
It's easy to reproduce this by enabling DFAO in the project, opening Window>Viewports>Viewport 2, and resizing the new window until the 3D area's height is zero.
There's no existing public thread on this issue, so head over to Questions & Answers just mention UE-58000 in the post.