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-rw-r--r--synapse/storage/events.py14
1 files changed, 10 insertions, 4 deletions
diff --git a/synapse/storage/events.py b/synapse/storage/events.py
index c98e524ba1..61223da1a5 100644
--- a/synapse/storage/events.py
+++ b/synapse/storage/events.py
@@ -67,7 +67,13 @@ state_delta_reuse_delta_counter = Counter(
 
 
 def encode_json(json_object):
-    return frozendict_json_encoder.encode(json_object)
+    """
+    Encode a Python object as JSON and return it in a Unicode string.
+    """
+    out = frozendict_json_encoder.encode(json_object)
+    if isinstance(out, bytes):
+        out = out.decode('utf8')
+    return out
 
 
 class _EventPeristenceQueue(object):
@@ -1058,7 +1064,7 @@ class EventsStore(EventFederationStore, EventsWorkerStore, BackgroundUpdateStore
 
                 metadata_json = encode_json(
                     event.internal_metadata.get_dict()
-                ).decode("UTF-8")
+                )
 
                 sql = (
                     "UPDATE event_json SET internal_metadata = ?"
@@ -1172,8 +1178,8 @@ class EventsStore(EventFederationStore, EventsWorkerStore, BackgroundUpdateStore
                     "room_id": event.room_id,
                     "internal_metadata": encode_json(
                         event.internal_metadata.get_dict()
-                    ).decode("UTF-8"),
-                    "json": encode_json(event_dict(event)).decode("UTF-8"),
+                    ),
+                    "json": encode_json(event_dict(event)),
                 }
                 for event, _ in events_and_contexts
             ],