diff --git a/api/utils/serializer/serializer.py b/api/utils/serializer/serializer.py
index f952df73..d9b19d72 100644
--- a/api/utils/serializer/serializer.py
+++ b/api/utils/serializer/serializer.py
@@ -217,7 +217,11 @@ class AbstractModelAPISerializer:
         conflict_geometries = geometry.get_conflict_geometries()
         for geom in conflict_geometries:
             try:
-                data = geom.get_data_objects(["identifier", "id"])[0]
+                data = geom.get_data_objects(["identifier", "id"])
+                if len(data) == 0:
+                    # expected behaviour in case of deleted data object
+                    continue
+                data = data[0]
             except KeyError:
                 raise AssertionError(f"Geometry {geom.id} is not attached to any entries. Contact an admin!")
             ids.append(