Jekyll 3.6.2 | Error Infinity

## I want to report a bug:
Plugin does not upload content

### What is the current behavior?
When I install and setup jekyll-algolia, I cannot upload any content even after following the instructions,

### What is your expected behavior?

### Git repository to reproduce the issue:
https://github.com/koolamusic/bourbon/

### Ruby version used:

ruby 2.5.5p157 (2019-03-15 revision 67260) [x86_64-linux]

### Jekyll version used:

jekyll 3.6.2

I am using the jasper theme https://github.com/jekyller/jasper2

Use the linked bourbon repository as the reproduction case, with Ruby 2.5.5, Jekyll 3.6.2, jekyll-algolia, and the Jasper theme. First follow the plugin setup instructions and capture the reported error while attempting an upload. Done means the site content uploads successfully, with the failure narrowed to a reproducible cause.

Written by the indexing model from the issue text.