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-rw-r--r--synapse/http/server.py5
1 files changed, 4 insertions, 1 deletions
diff --git a/synapse/http/server.py b/synapse/http/server.py
index 0df1bfbeef..897ba5e453 100644
--- a/synapse/http/server.py
+++ b/synapse/http/server.py
@@ -563,7 +563,10 @@ class _ByteProducer:
 
         try:
             self._request.registerProducer(self, True)
-        except RuntimeError as e:
+        except AttributeError as e:
+            # Calling self._request.registerProducer might raise an AttributeError since
+            # the underlying Twisted code calls self._request.channel.registerProducer,
+            # however self._request.channel will be None if the connection was lost.
             logger.info("Connection disconnected before response was written: %r", e)
 
             # We drop our references to data we'll not use.