You can solve this by updating the options array in the initialize.countup.js file. Set a value for the separator key. See the below as an example.
var options = {
useEasing : setting.easing,
useGrouping : setting.grouping,
separator : ',',
decimal : setting.decimal,
prefix : setting.prefix,
suffix : setting.suffix
};
This unfortunately doesn’t give you the flexibility to use multiple separators but it doesn’t throw undefined anymore. We used it on our website https://www.wplauncher.com/hosting. I also figured out how to have multiple instances on one page. Reach out if you want more info.
