diff --git a/homeassistant/components/alexa/capabilities.py b/homeassistant/components/alexa/capabilities.py
index 133ad4f2bda..327d5973892 100644
--- a/homeassistant/components/alexa/capabilities.py
+++ b/homeassistant/components/alexa/capabilities.py
@@ -822,6 +822,8 @@ class AlexaInputController(AlexaCapability):
         """Return list of supported inputs."""
         input_list = []
         for source in source_list:
+            if not isinstance(source, str):
+                continue
             formatted_source = (
                 source.lower().replace("-", "").replace("_", "").replace(" ", "")
             )
diff --git a/tests/components/alexa/test_capabilities.py b/tests/components/alexa/test_capabilities.py
index 8a9a40e3217..d24849e1006 100644
--- a/tests/components/alexa/test_capabilities.py
+++ b/tests/components/alexa/test_capabilities.py
@@ -182,7 +182,7 @@ async def test_api_increase_color_temp(hass, result, initial):
 @pytest.mark.parametrize(
     "domain,payload,source_list,idx",
     [
-        ("media_player", "GAME CONSOLE", ["tv", "game console"], 1),
+        ("media_player", "GAME CONSOLE", ["tv", "game console", 10000], 1),
         ("media_player", "SATELLITE TV", ["satellite-tv", "game console"], 0),
         ("media_player", "SATELLITE TV", ["satellite_tv", "game console"], 0),
         ("media_player", "BAD DEVICE", ["satellite_tv", "game console"], None),