Build error on github pages: Liquid Exception: no implicit conversion of nil into String

[sylhare]

So I have a rather generic build fail error on my gh-pages. However everything is working fine on the local host. So it means github fails to build the site, a bummer for a template ...

Here is the error message I got from github:

Liquid Exception: no implicit conversion of nil into String in /_layouts/page.html
           Fatal: TypeError
                    no implicit conversion of nil into String

It seems something is wrong either in my page.html or my _layout folder.

[sylhare]

The problem was because of this on _layout/_page.html :

id="{{ page.title | cgi_escape }}

The proposed solution was to replace it by:

id = {{ page.title | default: "" | cgi_escape }}

So we don't have the nil error. It happened for page without front matter or title. Here are some sources for the answer:

• Jekyll: Liquid filter “cgi_escape” returns error for some variables
• Jekyll Error “Liquid Exception: undefined method `encoding' for nil:NilClass in _layouts/post.html”