Bottom "Edit" button on View Discount page gives malformed URL

Created by: patrickg2

View a discount code at: http://www.example.com/civicrm/cividiscount/discount/view?id=1&reset=1

Click on Edit button at top of page, and it works, with this URL: http://www.example.com/civicrm/cividiscount/discount/edit?reset=1&id=1

Click on Edit button at bottom of page, and it doesn't work, with this URL: http://www.example.com/civicrm/contact/view/contribution?reset=1&id=1&cid=&action=update&context= gives this error:

Sorry but we are not able to provide this at the moment. cid (value: ) is not of the type Positive

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