diff --git a/wcs/backoffice/snapshots.py b/wcs/backoffice/snapshots.py
index 24194cd8c..5f9c937f4 100644
--- a/wcs/backoffice/snapshots.py
+++ b/wcs/backoffice/snapshots.py
@@ -165,7 +165,7 @@ class SnapshotsDirectory(Directory):
             # remove empty ins and del tags
             for elem in panel.find('ins, del'):
                 d = pq(elem)
-                if not d.html().strip():
+                if not (d.html() or '').strip():
                     d.remove()
             # prevent auto-closing behaviour of pyquery .html() method
             for elem in panel.find('span, ul, div'):