JSON error prevents modal from closing

Inside an admin page for WS Forms, clicking on a link to view an entry brings up the Philantro modal instead. Once it’s open, it won’t close because of this error: Uncaught SyntaxError: JSON.parse: unterminated string at line 1 column 121 of the JSON data.

Inspecting the string shows that the JSON is breaking at what would be the @ in the email address for organization_email: "[{\"first_name\":\"\",\"last_name\":\"\",\"email\":\"\",\"amount\":0,\"currency_symbol\":\"$\",\"color\":\"#9e3434\",\"organization_email\":\"jim".