What did you do? ================ Load revision dashboard for some older users, such as clicking the "View All Activity" button on the profile: https://developer.mozilla.org/en-US/profiles/sebmozilla https://developer.mozilla.org/en-US/dashboards/revisions?user=sebmozilla What happened? ============== An Internal Server Error is returned What should have happened? ========================== A list of revisions by that user, such as: https://developer.mozilla.org/en-US/dashboards/revisions?user=jwhitlock Is there anything else we should know? ====================================== Tracked in Sentry: https://sentry.prod.mozaws.net/operations/mdn-prod/issues/692434/ UndefinedError: 'kuma.wiki.models.Revision_Deferred_content object' has no attribute 'previous' It appears to be accessed here: https://github.com/mozilla/kuma/blob/master/kuma/dashboards/jinja2/dashboards/includes/revision_dashboard_body.html#L20 and has started after this PR was merged: https://github.com/mozilla/kuma/pull/4520
The problem appears to be when a user has revisions on a soft-deleted document.
Summary: ISE for revision dashboard when filtering by user → ISE for revision dashboard when filtering by some users
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