We don’t use Fresnel but Unreal have in it’s editor content some default materials with Fresnel, but we didn’t use them. Do you think it could impact the build?
it’s a material node - if you don’t have it then your crash must be from something else 
Have you been able to repro this in a blank project by change other than just your project? If so, can you provide the steps here.
I currently don’t have any way of reproducing this and some of the logs are a mess that I’d have to manually go through and space them out to make sense, which is not something I don’t have the time to do.
The one that I was able to read was S7_E3_New.txt but I didn’t see anything useful in the log.