Uncaught TypeError: Cannot read property 'tf' of undefined

[janthonyeconomist]

I'm not sure if this is a bug for you, or for Lunr, but seeing as it has to do with the index, and this is what I'm using to build the index, I thought I would start here.

So I'm getting the error Uncaught TypeError: Cannot read property 'tf' of undefined. It seems to have to do with parsing vector similarities. The code seems to be looking for tf on a document in the tokenStore.
https://cl.ly/1B3f1m0B391b

My lunr configs look like:

      metalsmithLunr({
        ref: 'id',
        indexPath: 'api/search-index.json',
        fields: {
          headline: 5,
          subheadline: 3,
          category: 5,
          tags: 3,
          contents: 1,
        },
        preprocess: function(content) {
          const tr = (str) => {
            const map = {"а":"a","б":"b",/*  truncated for issue  */"І":"I","і":"i"};
            let new_str = "", char, substitute, n = str.length;
            for(let i = 0; i < n; i++) {
                char = str[i];
                substitute = map[char];
                new_str += substitute ? substitute : char;
            }
            return new_str;
          };
          return tr(
            content.replace(/<[^>]+>/g, ' ') // Strip HTML
          ) // Transliterate foreign characters
            .replace(/[^\w]/g, ' ') // Strip Punctuation
          ;
        },
      }),

And the client side code looks like:

    let ip = new Promise((resolve, reject) => {
      $.getJSON('/api/search-index.json', data => {
        console.log('SEARCH DATA', data);
        resolve(lunr.Index.load(data));
      });
    });

and then later:

      if (keywords) {
        SearchService.results = SearchService.index.search(keywords);
      }

I can provide the index data or the serialized index object if you would like.

[janthonyeconomist]

Do give you more information, I seem to only get the error when I have a field in the fields object that is optional. In the example above, I think the subheadline is present, but always has an empty value.