Jekyll fails with Error: undefined method `merge!' for nil:NilClass
Using Jekyll 3.8.6, installed plugins "Jekyll-Scholar" and "Jekyll-Latex-PDF"
No special things yet, except some markup from "Tufte-Jekyll".
When running Jekyll "jekyll s" it stops with the following output:
Logging at level: debug Configuration file: /Users/nils/ownCloud/Privat_Projekte/Klimaliste/Webseite/klimaliste_test/_config.yml Logging at level: debug Requiring: /Users/nils/ownCloud/Privat_Projekte/Klimaliste/Webseite/klimaliste_test/_plugins/sidenote.rb Requiring: /Users/nils/ownCloud/Privat_Projekte/Klimaliste/Webseite/klimaliste_test/_plugins/main_columns_img.rb Requiring: /Users/nils/ownCloud/Privat_Projekte/Klimaliste/Webseite/klimaliste_test/_plugins/fullwidth.rb Requiring: /Users/nils/ownCloud/Privat_Projekte/Klimaliste/Webseite/klimaliste_test/_plugins/mathjaxtag.rb Requiring: /Users/nils/ownCloud/Privat_Projekte/Klimaliste/Webseite/klimaliste_test/_plugins/newthought.rb Requiring: /Users/nils/ownCloud/Privat_Projekte/Klimaliste/Webseite/klimaliste_test/_plugins/marginnote.rb Requiring: /Users/nils/ownCloud/Privat_Projekte/Klimaliste/Webseite/klimaliste_test/_plugins/margin_figure.rb Requiring: jekyll-scholar Requiring: jekyll-latex-pdf Source: /Users/nils/ownCloud/Privat_Projekte/Klimaliste/Webseite/klimaliste_test Destination: /Users/nils/ownCloud/Privat_Projekte/Klimaliste/Webseite/klimaliste_test/_site Incremental build: disabled. Enable with --incremental Generating... EntryFilter: excluded /README.md Reading: _posts/2019-07-29-First-Post.md Reading: _posts/2016-03-24-welcome-to-jekyll.markdown Reading: _posts/2019-07-31-Stellungnahme-Grossparkplatz.md Generating: Jekyll::Scholar::DetailsGenerator finished in 3.8e-05 seconds. jekyll 3.8.6 | Error: undefined method 'merge!' for nil:NilClass