diff --git a/src/General/lib/clone.class b/src/General/lib/clone.class
index 483617bda..6f6f3c81e 100755
--- a/src/General/lib/clone.class
+++ b/src/General/lib/clone.class
@@ -78,7 +78,7 @@ class Clone extends Post
     root.dataset.clone = origin.clones.push(@) - 1
 
   cloneWithoutVideo: (node) ->
-    if node.tagName is 'VIDEO'
+    if node.tagName is 'VIDEO' and !node.dataset.md5 # (exception for WebM thumbnails)
       []
     else if node.nodeType is Node.ELEMENT_NODE and $ 'video', node
       clone = node.cloneNode false