diff --git a/homeassistant/components/coronavirus/sensor.py b/homeassistant/components/coronavirus/sensor.py
index 2887427ec6b..d24c33a7752 100644
--- a/homeassistant/components/coronavirus/sensor.py
+++ b/homeassistant/components/coronavirus/sensor.py
@@ -51,9 +51,14 @@ class CoronavirusSensor(Entity):
     def state(self):
         """State of the sensor."""
         if self.country == OPTION_WORLDWIDE:
-            return sum(
-                getattr(case, self.info_type) for case in self.coordinator.data.values()
-            )
+            sum_cases = 0
+            for case in self.coordinator.data.values():
+                value = getattr(case, self.info_type)
+                if value is None:
+                    continue
+                sum_cases += value
+
+            return sum_cases
 
         return getattr(self.coordinator.data[self.country], self.info_type)
 
diff --git a/tests/components/coronavirus/conftest.py b/tests/components/coronavirus/conftest.py
index 6e49d2aa164..bbe5a463802 100644
--- a/tests/components/coronavirus/conftest.py
+++ b/tests/components/coronavirus/conftest.py
@@ -13,6 +13,13 @@ def mock_cases():
         return_value=[
             Mock(country="Netherlands", confirmed=10, recovered=8, deaths=1, current=1),
             Mock(country="Germany", confirmed=1, recovered=0, deaths=0, current=0),
+            Mock(
+                country="Sweden",
+                confirmed=None,
+                recovered=None,
+                deaths=None,
+                current=None,
+            ),
         ],
     ) as mock_get_cases:
         yield mock_get_cases