diff --git a/folium/plugins/heat_map_withtime.py b/folium/plugins/heat_map_withtime.py
index 88db1ff95a..9f62fb4b31 100644
--- a/folium/plugins/heat_map_withtime.py
+++ b/folium/plugins/heat_map_withtime.py
@@ -286,15 +286,16 @@ def _get_self_bounds(self):
 
         """
         bounds = [[None, None], [None, None]]
-        for point in self.data:
-            bounds = [
-                [
-                    none_min(bounds[0][0], point[0]),
-                    none_min(bounds[0][1], point[1]),
-                ],
-                [
-                    none_max(bounds[1][0], point[0]),
-                    none_max(bounds[1][1], point[1]),
-                ],
-            ]
+        for points in self.data:
+            for point in points:
+                bounds = [
+                    [
+                        none_min(bounds[0][0], point[0]),
+                        none_min(bounds[0][1], point[1]),
+                    ],
+                    [
+                        none_max(bounds[1][0], point[0]),
+                        none_max(bounds[1][1], point[1]),
+                    ],
+                ]
         return bounds
diff --git a/tests/plugins/test_heat_map_withtime.py b/tests/plugins/test_heat_map_withtime.py
index 429a8021d9..320cfc77d7 100644
--- a/tests/plugins/test_heat_map_withtime.py
+++ b/tests/plugins/test_heat_map_withtime.py
@@ -79,3 +79,17 @@ def test_heat_map_with_time():
     """)
 
     assert normalize(tmpl.render(this=hm)) in out
+
+
+def test_heat_map_with_time_bounds():
+    data = [
+        [[50.0, 4.0], [51.0, 5.0]],
+        [[48.0, 3.0, 0.5], [52.0, 6.0]],
+        [],
+    ]
+    m = folium.Map()
+    folium.Marker([49.0, 7.0]).add_to(m)
+    hm = plugins.HeatMapWithTime(data).add_to(m)
+
+    assert hm.get_bounds() == [[48.0, 3.0], [52.0, 6.0]]
+    assert m.get_bounds() == [[48.0, 3.0], [52.0, 7.0]]