diff --git a/datadog_lambda/trigger.py b/datadog_lambda/trigger.py
index b574b8f4..2dffd0b4 100644
--- a/datadog_lambda/trigger.py
+++ b/datadog_lambda/trigger.py
@@ -39,6 +39,8 @@ def parse_event_source(event):
         api-gateway | application-load-balancer | cloudwatch-logs |
         cloudwatch-events | cloudfront | dynamodb | kinesis | s3 | sns | sqs
     """
+    if type(event) is not dict:
+        return
     event_source = event.get("eventSource") or event.get("EventSource")
 
     request_context = event.get("requestContext")
diff --git a/tests/test_trigger.py b/tests/test_trigger.py
index bc60e85a..85bd4e6b 100644
--- a/tests/test_trigger.py
+++ b/tests/test_trigger.py
@@ -330,6 +330,12 @@ def test_extract_trigger_tags_unsupported(self):
         tags = extract_trigger_tags(event, ctx)
         self.assertEqual(tags, {})
 
+    def test_extract_trigger_tags_list_type_event(self):
+        event = []
+        ctx = get_mock_context()
+        tags = extract_trigger_tags(event, ctx)
+        self.assertEqual(tags, {})
+
 
 class ExtractHTTPStatusCodeTag(unittest.TestCase):
     def test_extract_http_status_code_tag_from_response_dict(self):