Index: openacs-4/packages/proctoring-support/lib/proctoring-display.tcl
===================================================================
RCS file: /usr/local/cvsroot/openacs-4/packages/proctoring-support/lib/Attic/proctoring-display.tcl,v
diff -u -r1.1.2.17 -r1.1.2.18
--- openacs-4/packages/proctoring-support/lib/proctoring-display.tcl	23 Feb 2022 16:01:42 -0000	1.1.2.17
+++ openacs-4/packages/proctoring-support/lib/proctoring-display.tcl	2 Mar 2022 15:38:13 -0000	1.1.2.18
@@ -153,15 +153,16 @@
                    coalesce(camera.timestamp,
                             desktop.timestamp) as timestamp,
                    null as audio_url,
-                   camera.revisions || desktop.revisions as revisions
+                   coalesce(camera.revisions, '[]') ||
+                     coalesce(desktop.revisions, '[]') as revisions
             from (select artifact_id,
                            timestamp,
                            file,
                            rank() over (
                                         partition by object_id, user_id
                                         order by timestamp asc
                                          ) as order,
-                           coalesce(metadata->'revisions', '[]') as revisions
+                           metadata->'revisions' as revisions
                   from proctoring_object_artifacts
                     where object_id = :object_id
                     and user_id = :user_id
@@ -175,7 +176,7 @@
                                         partition by object_id, user_id
                                         order by timestamp asc
                                          ) as order,
-                           coalesce(metadata->'revisions', '[]') as revisions
+                           metadata->'revisions' as revisions
                      from proctoring_object_artifacts
                     where object_id = :object_id
                     and user_id = :user_id