diff --git a/active_statistics/statistics/plots/average_heartrate_by_average_speed.py b/active_statistics/statistics/plots/average_heartrate_by_average_speed.py
index 74eff81..14afb1a 100644
--- a/active_statistics/statistics/plots/average_heartrate_by_average_speed.py
+++ b/active_statistics/statistics/plots/average_heartrate_by_average_speed.py
@@ -146,7 +146,8 @@ def get_scatter_plot(
         for i in range(
             min(start_timestamps),
             max(start_timestamps),
-            (max(start_timestamps) - min(start_timestamps)) // 5,
+            # The outter max is stopping this from going below 1, which can happen in cases of very few activities.
+            max(1, (max(start_timestamps) - min(start_timestamps)) // 5),
         )
     ]
     ticktext = [dt.datetime.fromtimestamp(i).strftime("%d/%m/%Y") for i in tickvals]
diff --git a/tests/test_visualisations/test_average_heartrate_by_average_speed.py b/tests/test_visualisations/test_average_heartrate_by_average_speed.py
index b68c352..bc436da 100644
--- a/tests/test_visualisations/test_average_heartrate_by_average_speed.py
+++ b/tests/test_visualisations/test_average_heartrate_by_average_speed.py
@@ -2,14 +2,18 @@
 
 from active_statistics.exceptions import UserVisibleException
 from active_statistics.statistics.plots.average_heartrate_by_average_speed import plot
+from tests.factories.activity_factories import ActivityFactory
 
 
-def test_average_heartrate_by_average_speed_animation(
-    some_basic_runs_and_rides,
-) -> None:
+def test_average_heartrate_by_average_speed_plot(some_basic_runs_and_rides) -> None:
     plot(some_basic_runs_and_rides)
 
 
 def test_no_data(no_activities_at_all) -> None:
     with pytest.raises(UserVisibleException):
         plot(no_activities_at_all)
+
+
+def test_average_heartrate_by_average_speed_few_activities() -> None:
+    activities = [ActivityFactory(), ActivityFactory()]
+    plot(_ for _ in activities)