Hi,
It could be an issue with your plugin or child theme customization.
If you are using a cache plugin, please clear it’s cache content and temporary disable it.
If you have a child theme with customization, activate back your Hueman theme ( parent ) and see if your Appearance -> Customize is working.
If it’s working, you will have to compare your customization with the Hueman theme codes and make necessary updates.
You can use the following steps to check if it’s a plugin issue.
Proceed to disable one plugin at a time and clear your browser history.
Re-visit your Appearance -> Customize and see if it works.
Do this until you find the plugin that’s causing issues.
Thank you
