diff --git a/src/actors.js b/src/actors.js
index f55824b..623eda3 100644
--- a/src/actors.js
+++ b/src/actors.js
@@ -559,6 +559,8 @@ export async function mergeActors(targetActorId, sourceActorId, reqUser) {
 	const [targetActor, sourceActor] = await Promise.all([
 		knex('actors')
 			.where('id', targetActorId)
+			.whereNull('entity_id')
+			.whereNull('alias_for')
 			.first(),
 		knex('actors')
 			.where('id', sourceActorId)