diff --git a/rhodecode/lib/channelstream.py b/rhodecode/lib/channelstream.py
--- a/rhodecode/lib/channelstream.py
+++ b/rhodecode/lib/channelstream.py
@@ -209,15 +209,16 @@ def update_history_from_logs(config, cha
 
 
 def write_history(config, message):
-    """ writes a messge to a base64encoded filename """
+    """ writes a message to a base64encoded filename """
     history_location = config.get('history.location')
     if not os.path.exists(history_location):
         return
     try:
         LOCK.acquire_write_lock()
         filepath = log_filepath(history_location, message['channel'])
+        json_message = json.dumps(message)
         with open(filepath, 'ab') as f:
-            json.dump(message, f)
+            f.write(json_message)
             f.write('\n')
     finally:
         LOCK.release_write_lock()