diff --git a/src/models/commentSchema.ts b/src/models/commentSchema.ts
index 191a682cfcd93ab1ed63ec7357d2c056011d1a10..c14af12666c4e3c1d8d72d0407a3ca2a5f39e61a 100644
--- a/src/models/commentSchema.ts
+++ b/src/models/commentSchema.ts
@@ -16,5 +16,5 @@ export const commentSchema = z.object({
   elementId: z.string(),
   id: z.number(),
   pinned: z.boolean(),
-  owner: z.string().optional(),
+  owner: z.string().nullable().optional(),
 });