diff --git a/client/src/stores/userTagsStore.ts b/client/src/stores/userTagsStore.ts
index 3c009c8f46d..47f717ddea0 100644
--- a/client/src/stores/userTagsStore.ts
+++ b/client/src/stores/userTagsStore.ts
@@ -11,7 +11,7 @@ export const useUserTagsStore = defineStore("userTagsStore", () => {
     const userTags = computed(() => {
         let tags: string[];
         if (currentUser.value && !currentUser.value.isAnonymous) {
-            tags = [...currentUser.value.tags_used, ...localTags.value];
+            tags = [...(currentUser.value.tags_used ?? []), ...localTags.value];
         } else {
             tags = localTags.value;
         }