diff --git a/mautrix_telegram/formatter.py b/mautrix_telegram/formatter.py
index ec186337..2aaba0fa 100644
--- a/mautrix_telegram/formatter.py
+++ b/mautrix_telegram/formatter.py
@@ -218,7 +218,8 @@ def telegram_event_to_matrix(evt, source):
                 + f"<blockquote>{html}</blockquote>")
 
     if evt.reply_to_msg_id:
-        msg = DBMessage.query.get((evt.reply_to_msg_id, source.tgid))
+        space = evt.to_id.channel_id if isinstance(evt, Message) and isinstance(evt.to_id, PeerChannel) else source.tgid
+        msg = DBMessage.query.get((evt.reply_to_msg_id, space))
         if msg:
             quote = f"<a href=\"https://matrix.to/#/{msg.mx_room}/{msg.mxid}\">Quote<br></a>"
             if html:
diff --git a/mautrix_telegram/portal.py b/mautrix_telegram/portal.py
index 0a522068..a3c9fce5 100644
--- a/mautrix_telegram/portal.py
+++ b/mautrix_telegram/portal.py
@@ -90,10 +90,10 @@ class Portal:
         # to deduplicate based on a hash of the message content.
 
         # The timestamp is only accurate to the second, so we can't rely on solely that either.
-        hash_content = [str(event.date.timestamp()), event.from_id, event.message]
+        hash_content = [event.date.timestamp(), event.message]
         if event.fwd_from:
             hash_content += [event.fwd_from.from_id, event.fwd_from.channel_id]
-        elif event.media:
+        elif isinstance(event, Message) and event.media:
             try:
                 hash_content += {
                     MessageMediaContact: lambda media: [media.user_id],