Jekyll错误“液体exception：nil的未定义方法`编码’：_layouts / post.html中的NilClass”
尝试运行jekyll build或jekyll serve时出现以下错误：
Liquid Exception: undefined method 'encoding' for nil:NilClass in _layouts/post.html jekyll 2.5.3 | Error: undefined method 'encoding' for nil:NilClass
它看起来是RVM / ruby文件的问题？ （请参阅下面的–trace日志）但我没有真正触及任何代码（特别是在任何ruby文件中没有）并且在最近几次提交中没有编辑’/_layouts/post.html’而这只是刚刚弹出起来。
这是Github上的存储库： https ： //github.com/ryanstraits/ryanstraits.github.io ，虽然主分支在发生此错误之前的最后一次提交。
没有太多严肃的程序员，所以我有点困惑。 任何帮助都会很棒。
这是我运行jekyll build --trace ：
Liquid Exception: undefined method encoding' for nil:NilClass in _layouts/post.html /Users/Straits/.rvm/rubies/ruby-2.2.0/lib/ruby/2.2.0/cgi/util.rb:8:inescape': undefined method encoding' for nil:NilClass (NoMethodError) from /Users/Straits/.rvm/gems/ruby-2.2.0/gems/jekyll-2.5.3/lib/jekyll/filters.rb:134:incgi_escape' from /Users/Straits/.rvm/gems/ruby-2.2.0/gems/liquid-2.6.2/lib/liquid/strainer.rb:43:in invoke' from /Users/Straits/.rvm/gems/ruby-2.2.0/gems/liquid-2.6.2/lib/liquid/context.rb:82:ininvoke' from /Users/Straits/.rvm/gems/ruby-2.2.0/gems/liquid-2.6.2/lib/liquid/variable.rb:50:in block in render' from /Users/Straits/.rvm/gems/ruby-2.2.0/gems/liquid-2.6.2/lib/liquid/variable.rb:38:ineach' from /Users/Straits/.rvm/gems/ruby-2.2.0/gems/liquid-2.6.2/lib/liquid/variable.rb:38:in inject' from /Users/Straits/.rvm/gems/ruby-2.2.0/gems/liquid-2.6.2/lib/liquid/variable.rb:38:inrender' from /Users/Straits/.rvm/gems/ruby-2.2.0/gems/liquid-2.6.2/lib/liquid/block.rb:109:in block in render_all' from /Users/Straits/.rvm/gems/ruby-2.2.0/gems/liquid-2.6.2/lib/liquid/block.rb:96:ineach' from /Users/Straits/.rvm/gems/ruby-2.2.0/gems/liquid-2.6.2/lib/liquid/block.rb:96:in render_all' from /Users/Straits/.rvm/gems/ruby-2.2.0/gems/liquid-2.6.2/lib/liquid/tags/if.rb:40:inblock (2 levels) in render' from /Users/Straits/.rvm/gems/ruby-2.2.0/gems/liquid-2.6.2/lib/liquid/tags/if.rb:38:in each' from /Users/Straits/.rvm/gems/ruby-2.2.0/gems/liquid-2.6.2/lib/liquid/tags/if.rb:38:inblock in render' from /Users/Straits/.rvm/gems/ruby-2.2.0/gems/liquid-2.6.2/lib/liquid/context.rb:112:in stack' from /Users/Straits/.rvm/gems/ruby-2.2.0/gems/liquid-2.6.2/lib/liquid/tags/if.rb:37:inrender' from /Users/Straits/.rvm/gems/ruby-2.2.0/gems/liquid-2.6.2/lib/liquid/block.rb:109:in block in render_all' from /Users/Straits/.rvm/gems/ruby-2.2.0/gems/liquid-2.6.2/lib/liquid/block.rb:96:ineach' from /Users/Straits/.rvm/gems/ruby-2.2.0/gems/liquid-2.6.2/lib/liquid/block.rb:96:in render_all' from /Users/Straits/.rvm/gems/ruby-2.2.0/gems/liquid-2.6.2/lib/liquid/tags/for.rb:117:inblock (2 levels) in render' from /Users/Straits/.rvm/gems/ruby-2.2.0/gems/liquid-2.6.2/lib/liquid/tags/for.rb:105:in each' from /Users/Straits/.rvm/gems/ruby-2.2.0/gems/liquid-2.6.2/lib/liquid/tags/for.rb:105:ineach_with_index' from /Users/Straits/.rvm/gems/ruby-2.2.0/gems/liquid-2.6.2/lib/liquid/tags/for.rb:105:in block in render' from /Users/Straits/.rvm/gems/ruby-2.2.0/gems/liquid-2.6.2/lib/liquid/context.rb:112:instack' from /Users/Straits/.rvm/gems/ruby-2.2.0/gems/liquid-2.6.2/lib/liquid/tags/for.rb:104:in render' from /Users/Straits/.rvm/gems/ruby-2.2.0/gems/liquid-2.6.2/lib/liquid/block.rb:109:inblock in render_all' from /Users/Straits/.rvm/gems/ruby-2.2.0/gems/liquid-2.6.2/lib/liquid/block.rb:96:in each' from /Users/Straits/.rvm/gems/ruby-2.2.0/gems/liquid-2.6.2/lib/liquid/block.rb:96:inrender_all' from /Users/Straits/.rvm/gems/ruby-2.2.0/gems/liquid-2.6.2/lib/liquid/block.rb:82:in render' from /Users/Straits/.rvm/gems/ruby-2.2.0/gems/liquid-2.6.2/lib/liquid/template.rb:128:inrender' from /Users/Straits/.rvm/gems/ruby-2.2.0/gems/liquid-2.6.2/lib/liquid/template.rb:138:in render!' from /Users/Straits/.rvm/gems/ruby-2.2.0/gems/jekyll-2.5.3/lib/jekyll/convertible.rb:106:inrender_liquid' from /Users/Straits/.rvm/gems/ruby-2.2.0/gems/jekyll-2.5.3/lib/jekyll/convertible.rb:205:in render_all_layouts' from /Users/Straits/.rvm/gems/ruby-2.2.0/gems/jekyll-2.5.3/lib/jekyll/convertible.rb:239:indo_layout' from /Users/Straits/.rvm/gems/ruby-2.2.0/gems/jekyll-2.5.3/lib/jekyll/post.rb:261:in render' from /Users/Straits/.rvm/gems/ruby-2.2.0/gems/jekyll-2.5.3/lib/jekyll/site.rb:298:inblock in render' from /Users/Straits/.rvm/gems/ruby-2.2.0/gems/jekyll-2.5.3/lib/jekyll/site.rb:297:in each' from /Users/Straits/.rvm/gems/ruby-2.2.0/gems/jekyll-2.5.3/lib/jekyll/site.rb:297:inrender' from /Users/Straits/.rvm/gems/ruby-2.2.0/gems/jekyll-2.5.3/lib/jekyll/site.rb:51:in process' from /Users/Straits/.rvm/gems/ruby-2.2.0/gems/jekyll-2.5.3/lib/jekyll/command.rb:28:inprocess_site' from /Users/Straits/.rvm/gems/ruby-2.2.0/gems/jekyll-2.5.3/lib/jekyll/commands/build.rb:56:in build' from /Users/Straits/.rvm/gems/ruby-2.2.0/gems/jekyll-2.5.3/lib/jekyll/commands/build.rb:34:inprocess' from /Users/Straits/.rvm/gems/ruby-2.2.0/gems/jekyll-2.5.3/lib/jekyll/commands/build.rb:18:in block (2 levels) in init_with_program' from /Users/Straits/.rvm/gems/ruby-2.2.0/gems/mercenary-0.3.5/lib/mercenary/command.rb:220:incall' from /Users/Straits/.rvm/gems/ruby-2.2.0/gems/mercenary-0.3.5/lib/mercenary/command.rb:220:in block in execute' from /Users/Straits/.rvm/gems/ruby-2.2.0/gems/mercenary-0.3.5/lib/mercenary/command.rb:220:ineach' from /Users/Straits/.rvm/gems/ruby-2.2.0/gems/mercenary-0.3.5/lib/mercenary/command.rb:220:in execute' from /Users/Straits/.rvm/gems/ruby-2.2.0/gems/mercenary-0.3.5/lib/mercenary/program.rb:42:ingo' from /Users/Straits/.rvm/gems/ruby-2.2.0/gems/mercenary-0.3.5/lib/mercenary.rb:19:in program' from /Users/Straits/.rvm/gems/ruby-2.2.0/gems/jekyll-2.5.3/bin/jekyll:20:in' from /Users/Straits/.rvm/gems/ruby-2.2.0/bin/jekyll:23:in load' from /Users/Straits/.rvm/gems/ruby-2.2.0/bin/jekyll:23:in ' from /Users/Straits/.rvm/gems/ruby-2.2.0/bin/ruby_executable_hooks:15:in eval' from /Users/Straits/.rvm/gems/ruby-2.2.0/bin/ruby_executable_hooks:15:in'
对我来说问题是：
{{ cgi_escape_title = page.title | cgi_escape }}
在我的_layouts/default.html ，对于没有page.title页面。
一种解决方案是做：
{{ page.title | default: "" | cgi_escape }}
将nul标题转换为"" ，或者如果你感觉更加冗长：
{% if page.title %} {% assign cgi_escape_title = page.title | cgi_escape %} {% else %} {% assign cgi_escape_title = '' %} {% endif %} {{ cgi_escape_title }}
在Jekyll 3.0.3上测试过。
发现问题：我的很多post是使用“Wordpress to Jekyll”转换器导入的，看起来它将“title：”字段留在了一些post的Front Matter中。 只是希望错误更具体一点。
我想在一天结束时的教训是：不要让你的前方问题空白，伙计们！