ERROR rendering this page

Template render error: (/home/travis/build/wolframkriesing/site-stitcher/templates/tidbit/page.html)
  Template render error: (/home/travis/build/wolframkriesing/site-stitcher/templates/tidbit/page.html)
  Template render error: (/home/travis/build/wolframkriesing/site-stitcher/templates/tidbit/page.html)
  Template render error: (/home/travis/build/wolframkriesing/site-stitcher/templates/tidbit/page.html) [Line 5, Column 3]
  Template render error: (/home/travis/build/wolframkriesing/site-stitcher/templates/tidbit/page.html) [Line 24, Column 3]
  Template render error: (/home/travis/build/wolframkriesing/site-stitcher/templates/tidbit/page.html) [Line 6, Column 5]
  Template render error: (/home/travis/build/wolframkriesing/site-stitcher/templates/tidbit/page.html) [Line 11, Column 3]
  Template render error: (/home/travis/build/wolframkriesing/site-stitcher/templates/tidbit/page.html) [Line 18, Column 3]
  Template render error: (/home/travis/build/wolframkriesing/site-stitcher/templates/tidbit/page.html) [Line 14, Column 44]
  attempted to output null or undefined value
    at Object._prettifyError (/home/travis/build/wolframkriesing/site-stitcher/node_modules/nunjucks/src/lib.js:36:11)
    at /home/travis/build/wolframkriesing/site-stitcher/node_modules/nunjucks/src/environment.js:561:19
    at Template.root [as rootRenderFunc] (eval at _compile (/home/travis/build/wolframkriesing/site-stitcher/node_modules/nunjucks/src/environment.js:631:18), :48:3)
    at Template.render (/home/travis/build/wolframkriesing/site-stitcher/node_modules/nunjucks/src/environment.js:550:10)
    at /home/travis/build/wolframkriesing/site-stitcher/node_modules/nunjucks/src/environment.js:364:27
    at Environment.getTemplate (/home/travis/build/wolframkriesing/site-stitcher/node_modules/nunjucks/src/environment.js:277:9)
    at Environment.render (/home/travis/build/wolframkriesing/site-stitcher/node_modules/nunjucks/src/environment.js:358:10)
    at renderTemplate (/home/travis/build/wolframkriesing/site-stitcher/src/_deps/render-template.js:24:24)
    at renderSinglePage (/home/travis/build/wolframkriesing/site-stitcher/src/render-tidbit/render-page.js:19:36)
    at /home/travis/build/wolframkriesing/site-stitcher/src/render-tidbit/render-page.js:32:72