Error after manuallying enabling users

When a user pays offline, we then manually enable their account in Membership Pro, but when clicking on the Enable button it's showing an error:

An error has occurred.
0 count(): Argument #1 ($value) must be of type Countable|array, null given

If you refresh the page, the account is enabled correctly. How can we fix the error please?

Hi Peter

This error causes by certain plugin uses on your site. For this, please submit a support ticket sending us super user account of your site and tell me ID of the subscription record which I can enable to see this issue

I will then check to see why the issue happens and get it sorted

Tuan