diff --git a/api/src/services/fields.ts b/api/src/services/fields.ts
index d695592f0b..89d0484987 100644
--- a/api/src/services/fields.ts
+++ b/api/src/services/fields.ts
@@ -364,6 +364,7 @@ export class FieldsService {
 			if (
 				(hookAdjustedField.type === 'alias' ||
 					this.schema.collections[collection].fields[field.field].type === 'alias') &&
+				hookAdjustedField.type &&
 				hookAdjustedField.type !== this.schema.collections[collection].fields[field.field].type
 			) {
 				throw new InvalidPayloadException('Alias type cannot be changed');