diff --git a/CHANGELOG.md b/CHANGELOG.md
index 8ce9127..2a9af3c 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -3,6 +3,7 @@
 * Improve form appearance
 * Add helper buttons next to datime fields
 * Change recent session view to current year instead of last 30 days
+* Fix bug when filtering only manual sessions (https://git.kucharczyk.xyz/lukas/timetracker/issues/51)
 
 ## 1.0.3 / 2023-02-20 17:16+01:00
 
diff --git a/games/templates/list_sessions.html b/games/templates/list_sessions.html
index 1777afb..54af222 100644
--- a/games/templates/list_sessions.html
+++ b/games/templates/list_sessions.html
@@ -6,7 +6,7 @@
 
 {% block content %}
         <div class="text-center text-xl mb-4 dark:text-slate-400">
-            {% if dataset.count >= 2 %}
+            {% if chart %}
             <img src="data:image/svg+xml;base64,{{ chart|safe }}" class="mx-auto mb-3" />
             {% endif %}
             {% if dataset.count >= 1 %}
diff --git a/games/views.py b/games/views.py
index ea362b8..c3b2a8d 100644
--- a/games/views.py
+++ b/games/views.py
@@ -181,8 +181,9 @@ def list_sessions(
     context["dataset"] = dataset
     # cannot use dataset[0] here because that might be only partial QuerySet
     context["last"] = Session.objects.all().order_by("timestamp_start").last()
-    # charts are always oldest->newest
-    if dataset.count() >= 2:
+    # only if 2 or more non-manual sessions exist
+    if dataset.filter(timestamp_end__isnull=False).count() >= 2:
+        # charts are always oldest->newest
         context["chart"] = playtime_over_time_chart(dataset.order_by("timestamp_start"))
 
     return render(request, "list_sessions.html", context)