Traceback when adding breakpoint at the first line of module (with IPython notebook)

[fabioz]

When trying to add a breakpoint at the first line, the traceback below is appearing (things still work as it falls back to tracing, but this shouldn't appear to the user at all):

Traceback (most recent call last):
  File "c:\bin\Miniconda\envs\jlab310\lib\site-packages\debugpy\_vendored\pydevd\_pydevd_frame_eval\pydevd_modify_bytecode.py", line 328, in insert_pydevd_breaks
    for new_instruction in get_instructions_to_add(
  File "c:\bin\Miniconda\envs\jlab310\lib\site-packages\debugpy\_vendored\pydevd\_pydevd_frame_eval\pydevd_modify_bytecode.py", line 102, in get_instructions_to_add
    Instr("LOAD_CONST", _pydev_stop_at_break, lineno=stop_at_line - 1),
  File "c:\bin\Miniconda\envs\jlab310\lib\site-packages\debugpy\_vendored\pydevd\_pydevd_frame_eval\vendored\bytecode\instr.py", line 171, in __init__
    self._set(name, arg, lineno)
  File "c:\bin\Miniconda\envs\jlab310\lib\site-packages\debugpy\_vendored\pydevd\_pydevd_frame_eval\vendored\bytecode\instr.py", line 239, in _set
    _check_lineno(lineno)
  File "c:\bin\Miniconda\envs\jlab310\lib\site-packages\debugpy\_vendored\pydevd\_pydevd_frame_eval\vendored\bytecode\instr.py", line 74, in _check_lineno
    raise ValueError("invalid lineno")
ValueError: invalid lineno