The Instance Members search engine expects a setInstance call, which it never gets via the dashboard panel framework.
Ideally this query shouldn't be possible to create like this.
Im not sure what I did... but I got this:
>>> UNRECOVERABLE FATAL ERROR <<< Call to a member function getPHID() on a non-object /core/lib/instances/src/applications/instances/query/InstancesMemberSearchEngine.php:35 ┻━┻ ︵ ¯\_(ツ)_/¯ ︵ ┻━┻