fix permalink

app.py

@@ -1142,7 +1142,8 @@ Any framework based on `llama-cpp-python` will let you select which chat templat
 
         permalink = None
         if meta.rem or meta.add:
-            permalink = link.split("&")[0] + '&' + urlencode(
+            qchar = '&' if 'branch' in query_params else '?'
+            permalink = link.split(qchar)[0] + qchar + urlencode(
                 {
                     'rem': meta.rem,
                     'add': [json.dumps([k, *v], ensure_ascii = False, separators = (',', ':')) for k, v in meta.add.items()],