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There's actually a method on \Drupal\views\ViewExecutable that tells us if there's a URL, I wonder if that's what we need to check here?

@dieterholvoet are you able to test this MR I'm about to open please?

steven jones → made their first commit to this issue’s fork.

Hitting the same issue. It's happening because Drupal\views_aggregator\Plugin\views\style\Table::preRender() creates a duplicate and executes it without saving. Down the line, in Drupal\views_data_export\Plugin\views\display\DataExport::attachTo(), $view->getUrl() is called and fails because the attached view doesn't have an ID yet, because it is new and unsaved.

I'm able to fix this in Views data export → by calling isNew() before trying to generate an url. I believe that's the way to go, so I'm moving this issue to that project.