diff --git a/app/javascript/mastodon/actions/markers.js b/app/javascript/mastodon/actions/markers.js
index 37d1ddccf..6cb09fe96 100644
--- a/app/javascript/mastodon/actions/markers.js
+++ b/app/javascript/mastodon/actions/markers.js
@@ -57,7 +57,7 @@ export const synchronouslySubmitMarkers = () => (dispatch, getState) => {
 const _buildParams = (state) => {
   const params = {};
 
-  const lastHomeId         = state.getIn(['timelines', 'home', 'items', 0]);
+  const lastHomeId         = state.getIn(['timelines', 'home', 'items']).find(item => item !== null);
   const lastNotificationId = state.getIn(['notifications', 'items', 0, 'id']);
 
   if (lastHomeId && compareId(lastHomeId, state.getIn(['markers', 'home'])) > 0) {