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-rw-r--r--synapse/push/mailer.py2
1 files changed, 1 insertions, 1 deletions
diff --git a/synapse/push/mailer.py b/synapse/push/mailer.py
index e38e3c5d44..ce299ba3da 100644
--- a/synapse/push/mailer.py
+++ b/synapse/push/mailer.py
@@ -892,7 +892,7 @@ def safe_text(raw_text: str) -> jinja2.Markup:
         A Markup object ready to safely use in a Jinja template.
     """
     return jinja2.Markup(
-        bleach.linkify(bleach.clean(raw_text, tags=[], attributes={}, strip=False))
+        bleach.linkify(bleach.clean(raw_text, tags=[], attributes=[], strip=False))
     )