diff --git a/mobile/lib/services/machine_learning/face_ml/person/person_service.dart b/mobile/lib/services/machine_learning/face_ml/person/person_service.dart
index 774267de1c..509862abc8 100644
--- a/mobile/lib/services/machine_learning/face_ml/person/person_service.dart
+++ b/mobile/lib/services/machine_learning/face_ml/person/person_service.dart
@@ -170,7 +170,13 @@ class PersonService {
         faceCount += cluster.faces.length;
         for (var faceId in cluster.faces) {
           if (faceIdToClusterID.containsKey(faceId)) {
-            throw Exception("Face $faceId is already assigned to a cluster");
+            final otherPersonID = clusterToPersonID[faceIdToClusterID[faceId]!];
+            if (otherPersonID != e.id) {
+              final otherPerson = await getPerson(otherPersonID!);
+              throw Exception(
+                "Face $faceId is already assigned to person $otherPersonID (${otherPerson!.data.name}) and person ${e.id} (${personData.name})",
+              );
+            }
           }
           faceIdToClusterID[faceId] = cluster.id;
         }