diff --git a/CHANGES.txt b/CHANGES.txt
index 26953db..2a67d35 100644
--- a/CHANGES.txt
+++ b/CHANGES.txt
@@ -1,3 +1,7 @@
+0.0.3  (2018-05-27)
+===================
+* retrieve thumbnail url
+
 0.0.2  (2018-05-22)
 ===================
 * additional support for password-based authentication
diff --git a/panopto/session.py b/panopto/session.py
index f789aef..009257c 100644
--- a/panopto/session.py
+++ b/panopto/session.py
@@ -62,7 +62,7 @@ def get_thumb_url(self, session_id):
                 auth=self.auth_info, sessionIds=[session_id])
 
             if response is None or len(response) < 1:
-                return ''
+                return None
 
             obj = serialize_object(response)
             return obj[0]['ThumbUrl']
diff --git a/setup.py b/setup.py
index 8163fa6..dcb79d5 100644
--- a/setup.py
+++ b/setup.py
@@ -27,7 +27,7 @@
 
 setup(
     name="pypanopto",
-    version="0.0.2",
+    version="0.0.3",
     author="Susan Dreher",
     author_email="sdreher@columbia.edu",
     url="https://github.com/ccnmtl/pypanopto",