diff --git a/packages/backend/src/remote/activitypub/models/person.ts b/packages/backend/src/remote/activitypub/models/person.ts
index 372ef99e11..16b265b0b3 100644
--- a/packages/backend/src/remote/activitypub/models/person.ts
+++ b/packages/backend/src/remote/activitypub/models/person.ts
@@ -413,8 +413,8 @@ export async function updatePerson(
 		isBot: getApType(object) === "Service",
 		isCat: (person as any).isCat === true,
 		isLocked: !!person.manuallyApprovesFollowers,
-		movedToUri: person.movedTo,
-		alsoKnownAs: person.alsoKnownAs,
+		movedToUri: person.movedTo || null,
+		alsoKnownAs: person.alsoKnownAs || null,
 		isExplorable: !!person.discoverable,
 	} as Partial<User>;