diff --git a/matrix_sync/sync/receiver.py b/matrix_sync/sync/receiver.py
index f27c636..71b0d49 100644
--- a/matrix_sync/sync/receiver.py
+++ b/matrix_sync/sync/receiver.py
@@ -13,6 +13,7 @@
 refresh = True
 next_batch = None
 client = None
+transfer = False
 
 class RoomMessageEvent(PluginEvent):
     def __init__(self, message: str, sender: str, room: Optional[str] = None):
@@ -22,38 +23,30 @@ def __init__(self, message: str, sender: str, room: Optional[str] = None):
         self.room = room
 
 async def message_callback(room: MatrixRoom, event: RoomMessageText) -> None:
+    global transfer
     user_id = matrix_sync.config.user_id
     room_name = matrix_sync.config.room_name
     roomMsg = f"[MSync|{room.display_name}] {room.user_name(event.sender)}: {event.body}"
-    transfer = True
     # Avoid echo messages.
-    if event.sender == user_id:
-        transfer = False
+    if not event.sender == user_id:
+        transfer = True
     # Apply settings config
     if not matrix_sync.config.settings["allow_all_rooms_msg"]:
         roomMsg = f"[MSync] {room.user_name(event.sender)}: {event.body}"
-        if not room.display_name == room_name:
-            transfer = False
-        else:
+        if room.display_name == room_name:
+            transfer = True
             psi.dispatch_event(RoomMessageEvent(event.body, room.user_name(event.sender)), (event.body, room.user_name(event.sender)))
     else:
         psi.dispatch_event(RoomMessageEvent(event.body, room.user_name(event.sender), room.display_name), (event.body, room.user_name(event.sender), room.display_name))
     if transfer:
         psi.broadcast(f"{roomMsg}")
 
-def sync_cache(data):
-    TOKEN_FILE = matrix_sync.config.TOKEN_FILE
-    with open(TOKEN_FILE, "r") as f:
-        existing_data = json.load(f)
-    existing_data["next_batch"] = data
-    with open(TOKEN_FILE, "w") as f:
-        json.dump(existing_data, f)
+
 
 def on_sync_response(response: SyncResponse):
-    global refresh
+    global refresh, next_batch
     if refresh:
         next_batch = response.next_batch
-        sync_cache(next_batch)
         refresh = False
     else:
         pass
@@ -86,8 +79,11 @@ async def getMsg() -> None:
             if sync_old_msg is True:
                 await client.sync_forever(timeout=5)
             else:
-                next_batch = await get_next_batch()
-                await client.sync_forever(timeout=5, since=next_batch)
+                if next_batch is not None:
+                    next_batch = await get_next_batch()
+                    await client.sync_forever(timeout=5, since=next_batch)
+                else:
+                    psi.logger.error("Sync failed: can't get 'next_batch' when sync.")
         else:
             psi.logger.error("Sync failed: homeserver is down or your network disconnected with it.")
             psi.logger.info("Use !!msync start after homeserver is running or your network restored.")