Pushin an existing experiment leads to a 'description' KeyError

pushing experiments/amohammadi/amohammadi/livdet/1/livdet [ModificationStatus.DOC_CHANGED]
Traceback (most recent call last):
  File "bin/beat", line 11, in <module>
    sys.exit(main())
  File "lib/python3.7/site-packages/click/core.py", line 829, in __call__
    return self.main(*args, **kwargs)
  File "lib/python3.7/site-packages/click/core.py", line 782, in main
    rv = self.invoke(ctx)
  File "lib/python3.7/site-packages/click/core.py", line 1259, in invoke
    return _process_result(sub_ctx.command.invoke(sub_ctx))
  File "lib/python3.7/site-packages/click/core.py", line 1259, in invoke
    return _process_result(sub_ctx.command.invoke(sub_ctx))
  File "lib/python3.7/site-packages/beat/cmdline/click_helper.py", line 121, in invoke
    return super().invoke(ctx)
  File "lib/python3.7/site-packages/click/core.py", line 1066, in invoke
    return ctx.invoke(self.callback, **ctx.params)
  File "lib/python3.7/site-packages/click/core.py", line 610, in invoke
    return callback(*args, **kwargs)
  File "lib/python3.7/site-packages/click/decorators.py", line 21, in new_func
    return f(get_current_context(), *args, **kwargs)
  File "lib/python3.7/site-packages/beat/cmdline/decorators.py", line 94, in _decorator
    value = view_func(*args, **kwargs)
  File "lib/python3.7/site-packages/beat/cmdline/commands.py", line 321, in push_impl
    indentation=0,
  File "lib/python3.7/site-packages/beat/cmdline/common.py", line 1497, in push
    data = {"description": message["description"]}
KeyError: 'description'

I am not sure what is the desired behavior here because the experiment already exists and is run.