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-rw-r--r--synapse/rest/media/v1/preview_url_resource.py2
1 files changed, 1 insertions, 1 deletions
diff --git a/synapse/rest/media/v1/preview_url_resource.py b/synapse/rest/media/v1/preview_url_resource.py
index ea46b8aa1b..4624b89014 100644
--- a/synapse/rest/media/v1/preview_url_resource.py
+++ b/synapse/rest/media/v1/preview_url_resource.py
@@ -344,8 +344,8 @@ class PreviewUrlResource(Resource):
                 # lines)
                 text_nodes = (
                     line.strip()
+                    for el in cloned_tree.iter() if el.text
                     for line in el.text.splitlines()
-                    for el in el.iter() if el.text
                 )
 
                 # Try to get a summary of between 200 and 500 words, respecting