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-rw-r--r--app/javascript/mastodon/actions/timelines.js2
1 files changed, 1 insertions, 1 deletions
diff --git a/app/javascript/mastodon/actions/timelines.js b/app/javascript/mastodon/actions/timelines.js
index cdaafd89c..09abe2702 100644
--- a/app/javascript/mastodon/actions/timelines.js
+++ b/app/javascript/mastodon/actions/timelines.js
@@ -37,7 +37,7 @@ export function updateTimeline(timeline, status) {
     if (status.in_reply_to_id) {
       let parent = getState().getIn(['statuses', status.in_reply_to_id]);
 
-      while (parent.get('in_reply_to_id')) {
+      while (parent && parent.get('in_reply_to_id')) {
         parents.push(parent.get('id'));
         parent = getState().getIn(['statuses', parent.get('in_reply_to_id')]);
       }