diff --git a/ckanext/dataset_series/actions.py b/ckanext/dataset_series/actions.py
index 19df339..1468cad 100644
--- a/ckanext/dataset_series/actions.py
+++ b/ckanext/dataset_series/actions.py
@@ -108,39 +108,44 @@ def _add_series_navigation(series_dict: dict) -> dict:
     if not series_dict.get("series_order_field"):
         return series_dict
 
-    first, last = _get_series_first_and_last(
+    first, last, count = _get_series_first_last_and_count(
         series_dict["id"], series_dict["series_order_field"]
     )
-    if first and last:
-        series_dict["series_navigation"] = {
-            "first": {
-                "id": first["id"],
-                "name": first["name"],
-                "title": first["title"],
-            },
-            "last": {
-                "id": last["id"],
-                "name": last["name"],
-                "title": last["title"],
-            },
+
+    series_dict["series_navigation"] = {
+        "count": count,
+        "first": None,
+        "last": None,
+    }
+    if first:
+        series_dict["series_navigation"]["first"] = {
+            "id": first["id"],
+            "name": first["name"],
+            "title": first["title"],
+        }
+    if last:
+        series_dict["series_navigation"]["last"] = {
+            "id": last["id"],
+            "name": last["name"],
+            "title": last["title"],
         }
 
     return series_dict
 
 
-def _get_series_first_and_last(series_id, order_field):
+def _get_series_first_last_and_count(series_id, order_field):
     search_params = {"fq": f"vocab_in_series:{series_id}", "rows": 1}
     first_result = toolkit.get_action("package_search")(
         {}, dict(search_params, sort=f"{order_field} asc")
     )
 
     if not first_result["results"]:
-        return None, None
+        return None, None, 0
 
     if first_result["count"] == 1:
-        return first_result["results"][0], first_result["results"][0]
+        return first_result["results"][0], first_result["results"][0], 1
 
     last_result = toolkit.get_action("package_search")(
         {}, dict(search_params, sort=f"{order_field} desc")
     )
-    return first_result["results"][0], last_result["results"][0]
+    return first_result["results"][0], last_result["results"][0], last_result["count"]
diff --git a/ckanext/dataset_series/tests/test_action.py b/ckanext/dataset_series/tests/test_action.py
index 7f0fee1..774414e 100644
--- a/ckanext/dataset_series/tests/test_action.py
+++ b/ckanext/dataset_series/tests/test_action.py
@@ -41,6 +41,8 @@ def test_series_navigation(series_fixtures):
 
     assert "series_navigation" in series_dict
 
+    assert series_dict["series_navigation"]["count"] == 3
+
     fields = ("id", "name", "title")
     for item, dataset in [("first", "dataset1"), ("last", "dataset3")]:
         for field in fields:
@@ -50,6 +52,24 @@ def test_series_navigation(series_fixtures):
             ), (item, dataset, field)
 
 
+@pytest.mark.usefixtures("with_plugins", "clean_db")
+@pytest.mark.ckan_config("ckan.plugins", "dataset_series scheming_datasets")
+@pytest.mark.ckan_config(
+    "scheming.dataset_schemas",
+    "ckanext.dataset_series.schemas:dataset_series.yaml "
+    "ckanext.dataset_series.schemas:dataset_in_series.yaml",
+)
+def test_empty_series_navigation(series_fixtures):
+
+    dataset_series = factories.Dataset(type="dataset-series", series_order_field="name")
+    series_dict = call_action("package_show", id=dataset_series["id"])
+
+    assert series_dict["series_navigation"]["count"] == 0
+
+    assert series_dict["series_navigation"]["first"] is None
+    assert series_dict["series_navigation"]["last"] is None
+
+
 @pytest.mark.usefixtures("with_plugins", "clean_db")
 @pytest.mark.ckan_config("ckan.plugins", "dataset_series scheming_datasets")
 @pytest.mark.ckan_config(