2026-05-11 13:32:35,782 UTC ERROR - Exception on /api/regenerate-backtest [POST]
Traceback (most recent call last):
  File "/usr/local/lib/python3.11/site-packages/flask/app.py", line 1511, in wsgi_app
    response = self.full_dispatch_request()
               ^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/usr/local/lib/python3.11/site-packages/flask/app.py", line 919, in full_dispatch_request
    rv = self.handle_user_exception(e)
         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/usr/local/lib/python3.11/site-packages/flask/app.py", line 917, in full_dispatch_request
    rv = self.dispatch_request()
         ^^^^^^^^^^^^^^^^^^^^^^^
  File "/usr/local/lib/python3.11/site-packages/flask/app.py", line 902, in dispatch_request
    return self.ensure_sync(self.view_functions[rule.endpoint])(**view_args)  # type: ignore[no-any-return]
           ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/app/main.py", line 94, in restart_backtest_with_params
    bot_runner.create_bot_and_run(backtest_args, strategy_params)
  File "/app/main.py", line 26, in create_bot_and_run
    self.bot_instance = Bot(bot_args, strategy_params)
                        ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/app/src/bot.py", line 63, in __init__
    self.pair = args.cryptocurrency + args.stablecoin
                ~~~~~~~~~~~~~~~~~~~~^~~~~~~~~~~~~~~~~
TypeError: unsupported operand type(s) for +: 'NoneType' and 'NoneType'