diff --git a/frontend/src/types.ts b/frontend/src/types.ts
index d7b0afd..f40f533 100644
--- a/frontend/src/types.ts
+++ b/frontend/src/types.ts
@@ -54,8 +54,8 @@ export type Post = {
 
 export type PostTagChange = {
     post:       Post
-    tag:        Tag
-    user?:      User
+    tag:        Tag | null
+    user:       User | null
     changeType: 'add' | 'remove'
     timestamp:  string }