diff --git a/models/video/watched_video_duration.sql b/models/video/watched_video_duration.sql
index a0e9cd4..ebab669 100644
--- a/models/video/watched_video_duration.sql
+++ b/models/video/watched_video_duration.sql
@@ -21,8 +21,8 @@ with
                 'http://adlnet.gov/expapi/verbs/terminated',
                 'https://w3id.org/xapi/video/verbs/seeked'
             )
-            and org in cast({org_filter:String}, 'Array(String)')
-            and course_key in cast({course_key_filter:String}, 'Array(String)')
+            and org in cast(coalesce({org_filter:String},'[]'), 'Array(String)')
+            and course_key in cast(coalesce({course_key_filter:String},'[]'), 'Array(String)')
     ),
     matches as (
         select