diff --git a/components/tools/OmeroWeb/omeroweb/webclient/tree.py b/components/tools/OmeroWeb/omeroweb/webclient/tree.py
index 73787a854c3..23ccc4db900 100644
--- a/components/tools/OmeroWeb/omeroweb/webclient/tree.py
+++ b/components/tools/OmeroWeb/omeroweb/webclient/tree.py
@@ -959,6 +959,9 @@ def _marshal_plate_acquisition(conn, row):
         start_time = datetime.utcfromtimestamp(unwrap(start_time) / 1000.0)
         end_time = datetime.utcfromtimestamp(unwrap(end_time) / 1000.0)
         plate_acquisition['name'] = '%s - %s' % (start_time, end_time)
+    elif start_time is not None:
+        start_time = datetime.utcfromtimestamp(unwrap(start_time) / 1000.0)
+        plate_acquisition['name'] = '%s' % start_time
     else:
         plate_acquisition['name'] = 'Run %d' % unwrap(pa_id)