System Information
Operating system: Linux Mint 18.3
Graphics card: Intel Corporation Xeon E3-1200 v3/4th Gen Core Processor Integrated Graphics Controller

Blender Version
Broken: 2.80, 079c7f918c81, blender2.7, 2019-06-01 22:51
Worked: 2.79

Short description of error
When I tried to use an image as a light source in Cycles (first with a spot lamp, then with a plane) it crashed Blender. I opened an old file I'd made in 2.79 in which I have an image projected from a spot lamp, and when I turned on viewport rendering, it works just fine, even though it's set up the same way as the spot lamp was in my new file.

*It works when the image is packed into the blend file, but not with an external image.* This is why the blend file I attached works, but if you replace that image file with an external image file and don't pack it, then Blender will crash when you try to render.

Exact steps for others to reproduce the error
Add a spot lamp and in the Object Data tab of the Properties menu, click Use Nodes - alternatively, add a plane, open edit mode, press U, go back to object mode. Give it an emission material. With the Emission node selected, press CTRL+T to add a Texture Coordinate node (using Normal for a lamp, or UV for a plane) connected to a Mapping node which plugs into the Vector input on an Image Texture node (load an image into the node) with the Color output connected to the Color input on the Emission node. Use viewport rendering, or press F12 to render. Blender crashes.