Can't Remove Client's Group Membership when groups doesn't have an active Loan

Scenario
1-Search for a group that has no active loan
2-click on a client inside this group
3-click Edit / Remove Group membership
4-click "Click here to remove group membership"
5-Click submit to remove the client's group membership

Result
An error is displayed that this client has an active loan (check group error.jpg)

expected result
Client's group membership is removed

Workaround
what we are currently doing is moving this client to any other group by
editing the group membership and just entering any group name in the "GROUP NAME" field

after the client is moved to that group
we can easily remove the group membership