Button is always loading

Hello,
When I click on the button, the button is always loading.
This is what the console of Chrome tells me.

The current user favorites were successfully loaded.

{status: “success”, favorites: Array(1)}

Unchecked runtime.lastError: The message port closed before a response was received.

The favorite was successfully saved.

{status: “error”, message: “Invalid post.”}

Somebody help me, please?
Thanks!!!