diff --git a/src/store/timeline.js b/src/store/timeline.js
index 0e39d883..5144a6bd 100644
--- a/src/store/timeline.js
+++ b/src/store/timeline.js
@@ -55,13 +55,17 @@ const mutations = {
 		state.account = account
 	},
 	boostPost(state, { post, parentAnnounce }) {
-		Vue.set(state.timeline[post.id].action.values, 'boosted', true)
+		if (!typeof state.timeline[post.id] === 'undefined') {
+			Vue.set(state.timeline[post.id].action.values, 'boosted', true)
+		}
 		if (parentAnnounce) {
 			Vue.set(state.timeline[parentAnnounce.id].cache[parentAnnounce.object].action.values, 'boosted', true)
 		}
 	},
 	unboostPost(state, { post, parentAnnounce }) {
-		Vue.set(state.timeline[post.id].action.values, 'boosted', false)
+		if (!typeof state.timeline[post.id] === 'undefined') {
+			Vue.set(state.timeline[post.id].action.values, 'boosted', false)
+		}
 		if (parentAnnounce) {
 			Vue.set(state.timeline[parentAnnounce.id].cache[parentAnnounce.object].action.values, 'boosted', false)
 		}