diff --git a/src/stores/reports.js b/src/stores/reports.js
index 2d9819442..f502e9f43 100644
--- a/src/stores/reports.js
+++ b/src/stores/reports.js
@@ -19,8 +19,9 @@ export const useReportsStore = defineStore('reports', {
   actions: {
     openUserReportingModal({ userId, statusIds = [] }) {
       const preTickedIds = new Set(statusIds)
-      // There shouldn't be a case where this is undefined
-      const userAllStatusesIds = useStatusesStore().statusesPerUser.get(userId)
+      // There could be a case (i.e. user is only ever mentioned in someone else's post -> user popover)
+      // where user has no known posts
+      const userAllStatusesIds = useStatusesStore().statusesPerUser.get(userId) ?? new Set()
       // Set constructor should take care of duplicated IDs and order,
       // later duplicated IDs will be dropped in favor of earlier
       const sortedIds = new Set([...preTickedIds, ...userAllStatusesIds])
diff --git a/src/stores/statuses.js b/src/stores/statuses.js
index 8a5938211..ceb51ceb6 100644
--- a/src/stores/statuses.js
+++ b/src/stores/statuses.js
@@ -534,7 +534,7 @@ export const useStatusesStore = defineStore('statuses', {
 
     // For when blocking a user
     wipeUserStatuses(userId) {
-      const removed = this.statusesPerUser.get(userId)
+      const removed = this.statusesPerUser.get(userId) ?? new Set()
       removed.forEach((statusId) => {
         const status = this.allStatuses.get(statusId)
         this.allStatuses.delete(statusId)