swift doc generate fails when generating html

[JaapWijnen]

Hi!
I'm on Ubuntu 18.04.4 LTS installed the Swift 5.2.4 release and built swift doc from source.
Generating markdown documentation works! But when trying to generate html instead the command fails with Illegal Instruction (core dumped). Any ideas what this could be?
I'm running swift doc generate ./Sources/ --module-name Vapor --output Documentation --format html
Some html seems to be generated before crashing (sometimes none at all)

[JaapWijnen]

also I'm using master branch for swift doc, which the same as the beta.3 release :) and I'm trying to build the documentation for vapor(master branch) www.github.com/vapor/vapor

[mattt]

Fixed by #140. Thanks again for your help with this, @JaapWijnen!