It seems there is a script which is not compatible with Merge Scripts.
You can try to enable/disable Async Execute first, if it won’t solve the issue, you may need to exclude the problematic script.
To find it, please following these steps:
- Enable logging on General tab and set the loglevel to Error
- Clear the cache for the homepage, and recache it.
- Open the page in incognito window, and check the error message in the console.
- Click to the error message, it will open the script and jumpt to the problematic line. Please find the comment above this line (eg:
/*https://yoursite.com/wp-content/plugins/plugin-name/assets/plugin.js*/), and exclude the problematic file from merging (add script URL to Footer Scripts, eg: