diff --git a/.gitignore b/.gitignore
index c98ac6922875de729f31e4657df5d0e947831df2..d195ee8170952097267ad68614ee9be622afb87d 100644
--- a/.gitignore
+++ b/.gitignore
@@ -1,3 +1,4 @@
 *.png
 *.ttf
 .env
+session.txt
diff --git a/adacher_matrix.py b/adacher_matrix.py
index 28f67fb64dc239a9c50cc6cdfac25c79fad9f88c..a38fa910e24a65df568444161f80bba126fd7b53 100755
--- a/adacher_matrix.py
+++ b/adacher_matrix.py
@@ -54,9 +54,10 @@ async def echo(room, event):
                     "mimetype": "image/png",
                     "h": height,
                     "w": width,
+                    "size": 0,
                     "thumbnail_url": uri,
                     },
-                "body": json.JSONEncoder().encode(cmd),
+                "body": cmd,
                 "m.relates_to": {
                     "m.in_reply_to": {
                         "event_id": event.event_id